161512554918 has 32 divisors (see below), whose sum is σ = 379498033152. Its totient is φ = 45178336800.

The previous prime is 161512554913. The next prime is 161512554937. The reversal of 161512554918 is 819455215161.

It is a happy number.

It is a super-2 number, since 2×161512554918² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161512554913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94120678 + ... + 94122393.

It is an arithmetic number, because the mean of its divisors is an integer number (11859313536).

Almost surely, 2^161512554918 is an apocalyptic number.

161512554918 is an abundant number, since it is smaller than the sum of its proper divisors (217985478234).

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

161512554918 is a wasteful number, since it uses less digits than its factorization.

161512554918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188243100.

The product of its digits is 432000, while the sum is 48.

The spelling of 161512554918 in words is "one hundred sixty-one billion, five hundred twelve million, five hundred fifty-four thousand, nine hundred eighteen".