1616216761 has 4 divisors (see below), whose sum is σ = 1655636724. Its totient is φ = 1576796800.

The previous prime is 1616216747. The next prime is 1616216783. The reversal of 1616216761 is 1676126161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1676126161 = 15887 ⋅105503.

It can be written as a sum of positive squares in 2 ways, for example, as 277022736 + 1339194025 = 16644^2 + 36595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616216761 - 2⁵ = 1616216729 is a prime.

It is a super-2 number, since 2×1616216761² = 5224313237074662242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1616216761.

It is not an unprimeable number, because it can be changed into a prime (1616016761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19709920 + ... + 19710001.

It is an arithmetic number, because the mean of its divisors is an integer number (413909181).

Almost surely, 2^1616216761 is an apocalyptic number.

It is an amenable number.

1616216761 is a deficient number, since it is larger than the sum of its proper divisors (39419963).

1616216761 is an equidigital number, since it uses as much as digits as its factorization.

1616216761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39419962.

The product of its digits is 18144, while the sum is 37.

The square root of 1616216761 is about 40202.1984597858. The cubic root of 1616216761 is about 1173.5453278836.

It can be divided in two parts, 16162 and 16761, that added together give a palindrome (32923).

The spelling of 1616216761 in words is "one billion, six hundred sixteen million, two hundred sixteen thousand, seven hundred sixty-one".