81372969570 has 32 divisors (see below), whose sum is σ = 195583647168. Its totient is φ = 21667400768.

The previous prime is 81372969547. The next prime is 81372969571. The reversal of 81372969570 is 7596927318.

It is a self number, because there is not a number n which added to its sum of digits gives 81372969570.

It is not an unprimeable number, because it can be changed into a prime (81372969571) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1982964 + ... + 2023583.

It is an arithmetic number, because the mean of its divisors is an integer number (6111988974).

Almost surely, 2^81372969570 is an apocalyptic number.

81372969570 is an abundant number, since it is smaller than the sum of its proper divisors (114210677598).

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

81372969570 is a wasteful number, since it uses less digits than its factorization.

81372969570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007234.

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 81372969570 in words is "eighty-one billion, three hundred seventy-two million, nine hundred sixty-nine thousand, five hundred seventy".