81082080642 has 16 divisors (see below), whose sum is σ = 169214777280. Its totient is φ = 25852257552.

The previous prime is 81082080641. The next prime is 81082080649. The reversal of 81082080642 is 24608028018.

It is a super-2 number, since 2×81082080642² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81082080642.

It is not an unprimeable number, because it can be changed into a prime (81082080641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293775517 + ... + 293775792.

It is an arithmetic number, because the mean of its divisors is an integer number (10575923580).

Almost surely, 2^81082080642 is an apocalyptic number.

81082080642 is an abundant number, since it is smaller than the sum of its proper divisors (88132696638).

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

81082080642 is a wasteful number, since it uses less digits than its factorization.

81082080642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587551337.

The product of its (nonzero) digits is 49152, while the sum is 39.

The spelling of 81082080642 in words is "eighty-one billion, eighty-two million, eighty thousand, six hundred forty-two".