81750862580 has 12 divisors (see below), whose sum is σ = 171676811460. Its totient is φ = 32700345024.

The previous prime is 81750862579. The next prime is 81750862621. The reversal of 81750862580 is 8526805718.

It can be written as a sum of positive squares in 2 ways, for example, as 61970127844 + 19780734736 = 248938^2 + 140644^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 2043771545 + ... + 2043771584.

It is an arithmetic number, because the mean of its divisors is an integer number (14306400955).

Almost surely, 2^81750862580 is an apocalyptic number.

It is an amenable number.

81750862580 is an abundant number, since it is smaller than the sum of its proper divisors (89925948880).

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

81750862580 is a wasteful number, since it uses less digits than its factorization.

81750862580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4087543138 (or 4087543136 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 50.

It can be divided in two parts, 817508 and 62580, that added together give a palindrome (880088).

The spelling of 81750862580 in words is "eighty-one billion, seven hundred fifty million, eight hundred sixty-two thousand, five hundred eighty".