815874985982 has 64 divisors (see below), whose sum is σ = 1463028134400. Its totient is φ = 340891588800.

The previous prime is 815874985973. The next prime is 815874986021. The reversal of 815874985982 is 289589478518.

It is a super-2 number, since 2×815874985982² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43051433 + ... + 43070379.

It is an arithmetic number, because the mean of its divisors is an integer number (22859814600).

Almost surely, 2^815874985982 is an apocalyptic number.

815874985982 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

815874985982 is a deficient number, since it is larger than the sum of its proper divisors (647153148418).

815874985982 is a wasteful number, since it uses less digits than its factorization.

815874985982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20542 (or 20528 counting only the distinct ones).

The product of its digits is 464486400, while the sum is 74.

The spelling of 815874985982 in words is "eight hundred fifteen billion, eight hundred seventy-four million, nine hundred eighty-five thousand, nine hundred eighty-two".