161676644 has 12 divisors (see below), whose sum is σ = 284036844. Its totient is φ = 80523264.

The previous prime is 161676607. The next prime is 161676667. The reversal of 161676644 is 446676161.

It can be written as a sum of positive squares in 2 ways, for example, as 114918400 + 46758244 = 10720^2 + 6838^2 .

It is a super-2 number, since 2×161676644² = 52278674430205472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77609 + ... + 79664.

It is an arithmetic number, because the mean of its divisors is an integer number (23669737).

Almost surely, 2^161676644 is an apocalyptic number.

It is an amenable number.

161676644 is a deficient number, since it is larger than the sum of its proper divisors (122360200).

161676644 is a wasteful number, since it uses less digits than its factorization.

161676644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157534 (or 157532 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 161676644 is about 12715.2130929843. The cubic root of 161676644 is about 544.7732345041.

The spelling of 161676644 in words is "one hundred sixty-one million, six hundred seventy-six thousand, six hundred forty-four".