161616772 has 12 divisors (see below), whose sum is σ = 283830736. Its totient is φ = 80522280.

The previous prime is 161616761. The next prime is 161616779. The reversal of 161616772 is 277616161.

It is a super-2 number, since 2×161616772² = 52239961983399968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161616779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70254 + ... + 72517.

Almost surely, 2^161616772 is an apocalyptic number.

It is an amenable number.

161616772 is a deficient number, since it is larger than the sum of its proper divisors (122213964).

161616772 is a wasteful number, since it uses less digits than its factorization.

161616772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143058 (or 143056 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 161616772 is about 12712.8585298508. The cubic root of 161616772 is about 544.7059794999.

The spelling of 161616772 in words is "one hundred sixty-one million, six hundred sixteen thousand, seven hundred seventy-two".