161567174990 has 64 divisors (see below), whose sum is σ = 332002976256. Its totient is φ = 56080699392.

The previous prime is 161567174987. The next prime is 161567175019. The reversal of 161567174990 is 99471765161.

It is a happy number.

It is a super-2 number, since 2×161567174990² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1864874 + ... + 1949586.

It is an arithmetic number, because the mean of its divisors is an integer number (5187546504).

Almost surely, 2^161567174990 is an apocalyptic number.

161567174990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161567174990 is an abundant number, since it is smaller than the sum of its proper divisors (170435801266).

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

161567174990 is a wasteful number, since it uses less digits than its factorization.

161567174990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85613.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 161567174990 in words is "one hundred sixty-one billion, five hundred sixty-seven million, one hundred seventy-four thousand, nine hundred ninety".