81445264356 has 24 divisors (see below), whose sum is σ = 191920526784. Its totient is φ = 26879624800.

The previous prime is 81445264343. The next prime is 81445264363. The reversal of 81445264356 is 65346254418.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33598320 + ... + 33600743.

It is an arithmetic number, because the mean of its divisors is an integer number (7996688616).

Almost surely, 2^81445264356 is an apocalyptic number.

It is an amenable number.

81445264356 is an abundant number, since it is smaller than the sum of its proper divisors (110475262428).

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

81445264356 is a wasteful number, since it uses less digits than its factorization.

81445264356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67199171 (or 67199169 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 48.

The spelling of 81445264356 in words is "eighty-one billion, four hundred forty-five million, two hundred sixty-four thousand, three hundred fifty-six".