1661244146 has 4 divisors (see below), whose sum is σ = 2491866222. Its totient is φ = 830622072.

The previous prime is 1661244133. The next prime is 1661244197. The reversal of 1661244146 is 6414421661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1563016225 + 98227921 = 39535^2 + 9911^2 .

It is a super-2 number, since 2×1661244146² = 5519464225238538632, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 415311035 + ... + 415311038.

Almost surely, 2^1661244146 is an apocalyptic number.

1661244146 is a deficient number, since it is larger than the sum of its proper divisors (830622076).

1661244146 is an equidigital number, since it uses as much as digits as its factorization.

1661244146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830622075.

The product of its digits is 27648, while the sum is 35.

The square root of 1661244146 is about 40758.3628964658. The cubic root of 1661244146 is about 1184.3438826614.

The spelling of 1661244146 in words is "one billion, six hundred sixty-one million, two hundred forty-four thousand, one hundred forty-six".