161774977 has 16 divisors (see below), whose sum is σ = 199413760. Its totient is φ = 127801152.

The previous prime is 161774959. The next prime is 161774983. The reversal of 161774977 is 779477161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161774977 - 2²³ = 153386369 is a prime.

It is a super-2 number, since 2×161774977² = 52342286366701058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161774977.

It is not an unprimeable number, because it can be changed into a prime (161774947) 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 15 ways as a sum of consecutive naturals, for example, 96448 + ... + 98110.

It is an arithmetic number, because the mean of its divisors is an integer number (12463360).

Almost surely, 2^161774977 is an apocalyptic number.

It is an amenable number.

161774977 is a deficient number, since it is larger than the sum of its proper divisors (37638783).

161774977 is a wasteful number, since it uses less digits than its factorization.

161774977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752.

The product of its digits is 518616, while the sum is 49.

The square root of 161774977 is about 12719.0792512666. The cubic root of 161774977 is about 544.8836572351.

The spelling of 161774977 in words is "one hundred sixty-one million, seven hundred seventy-four thousand, nine hundred seventy-seven".