161854490576 has 20 divisors (see below), whose sum is σ = 313900250244. Its totient is φ = 80847974400.

The previous prime is 161854490557. The next prime is 161854490591. The reversal of 161854490576 is 675094458161.

It can be written as a sum of positive squares in 2 ways, for example, as 53442342976 + 108412147600 = 231176^2 + 329260^2 .

It is a super-2 number, since 2×161854490576² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 4937585 + ... + 4970256.

Almost surely, 2^161854490576 is an apocalyptic number.

161854490576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161854490576 is a deficient number, since it is larger than the sum of its proper divisors (152045759668).

161854490576 is a wasteful number, since it uses less digits than its factorization.

161854490576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9908870 (or 9908864 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 161854490576 in words is "one hundred sixty-one billion, eight hundred fifty-four million, four hundred ninety thousand, five hundred seventy-six".