816939785980 has 48 divisors (see below), whose sum is σ = 1731639684096. Its totient is φ = 323723312640.

The previous prime is 816939785929. The next prime is 816939786023. The reversal of 816939785980 is 89587939618.

It is a super-2 number, since 2×816939785980² (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 15 ways as a sum of consecutive naturals, for example, 1482040 + ... + 1957120.

It is an arithmetic number, because the mean of its divisors is an integer number (36075826752).

Almost surely, 2^816939785980 is an apocalyptic number.

It is an amenable number.

816939785980 is an abundant number, since it is smaller than the sum of its proper divisors (914699898116).

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

816939785980 is a wasteful number, since it uses less digits than its factorization.

816939785980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475894 (or 475892 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 73.

The spelling of 816939785980 in words is "eight hundred sixteen billion, nine hundred thirty-nine million, seven hundred eighty-five thousand, nine hundred eighty".