81452915164 has 24 divisors (see below), whose sum is σ = 142819107200. Its totient is φ = 40647504240.

The previous prime is 81452915101. The next prime is 81452915179. The reversal of 81452915164 is 46151925418.

It is a super-2 number, since 2×81452915164² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12765727 + ... + 12772105.

Almost surely, 2^81452915164 is an apocalyptic number.

It is an amenable number.

81452915164 is a deficient number, since it is larger than the sum of its proper divisors (61366192036).

81452915164 is a wasteful number, since it uses less digits than its factorization.

81452915164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12073 (or 12071 counting only the distinct ones).

The product of its digits is 345600, while the sum is 46.

The spelling of 81452915164 in words is "eighty-one billion, four hundred fifty-two million, nine hundred fifteen thousand, one hundred sixty-four".