77016561 has 8 divisors (see below), whose sum is σ = 102746304. Its totient is φ = 51315600.

The previous prime is 77016551. The next prime is 77016571. The reversal of 77016561 is 16561077.

It is an interprime number because it is at equal distance from previous prime (77016551) and next prime (77016571).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77016561 - 2⁵ = 77016529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77016551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 12411.

It is an arithmetic number, because the mean of its divisors is an integer number (12843288).

Almost surely, 2^77016561 is an apocalyptic number.

It is an amenable number.

77016561 is a deficient number, since it is larger than the sum of its proper divisors (25729743).

77016561 is a wasteful number, since it uses less digits than its factorization.

77016561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14391.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 77016561 is about 8775.9079872114. The cubic root of 77016561 is about 425.4625846748.

It can be divided in two parts, 77016 and 561, that added together give a palindrome (77577).

The spelling of 77016561 in words is "seventy-seven million, sixteen thousand, five hundred sixty-one".