161881756974 has 36 divisors (see below), whose sum is σ = 408008103984. Its totient is φ = 46251930312.

The previous prime is 161881756963. The next prime is 161881757029. The reversal of 161881756974 is 479657188161.

161881756974 is a `hidden beast` number, since 1 + 61 + 8 + 8 + 1 + 7 + 569 + 7 + 4 = 666.

161881756974 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 91768822 + ... + 91770585.

It is an arithmetic number, because the mean of its divisors is an integer number (11333558444).

Almost surely, 2^161881756974 is an apocalyptic number.

161881756974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161881756974 is an abundant number, since it is smaller than the sum of its proper divisors (246126347010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161881756974 is a wasteful number, since it uses less digits than its factorization.

161881756974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183539429 (or 183539419 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 161881756974 in words is "one hundred sixty-one billion, eight hundred eighty-one million, seven hundred fifty-six thousand, nine hundred seventy-four".