81304950612 has 12 divisors (see below), whose sum is σ = 189711551456. Its totient is φ = 27101650200.

The previous prime is 81304950577. The next prime is 81304950653. The reversal of 81304950612 is 21605940318.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×81304950612² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3387706264 + ... + 3387706287.

Almost surely, 2^81304950612 is an apocalyptic number.

It is an amenable number.

81304950612 is an abundant number, since it is smaller than the sum of its proper divisors (108406600844).

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

81304950612 is a wasteful number, since it uses less digits than its factorization.

81304950612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775412558 (or 6775412556 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 81304950612 in words is "eighty-one billion, three hundred four million, nine hundred fifty thousand, six hundred twelve".