81164828012 has 12 divisors (see below), whose sum is σ = 142053917376. Its totient is φ = 40577994480.

The previous prime is 81164827993. The next prime is 81164828023. The reversal of 81164828012 is 21082846118.

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, 1063388 + ... + 1137155.

It is an arithmetic number, because the mean of its divisors is an integer number (11837826448).

Almost surely, 2^81164828012 is an apocalyptic number.

It is an amenable number.

81164828012 is a deficient number, since it is larger than the sum of its proper divisors (60889089364).

81164828012 is a wasteful number, since it uses less digits than its factorization.

81164828012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209768 (or 2209766 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The spelling of 81164828012 in words is "eighty-one billion, one hundred sixty-four million, eight hundred twenty-eight thousand, twelve".