861313313538 has 40 divisors (see below), whose sum is σ = 1933108062732. Its totient is φ = 286639081344.

The previous prime is 861313313503. The next prime is 861313313599. The reversal of 861313313538 is 835313313168.

861313313538 is a `hidden beast` number, since 8 + 613 + 13 + 3 + 13 + 5 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 827050192929 + 34263120609 = 909423^2 + 185103^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861313313493 and 861313313502.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4208595 + ... + 4408502.

Almost surely, 2^861313313538 is an apocalyptic number.

861313313538 is an abundant number, since it is smaller than the sum of its proper divisors (1071794749194).

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

861313313538 is a wasteful number, since it uses less digits than its factorization.

861313313538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8617728 (or 8617719 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 861313313538 in words is "eight hundred sixty-one billion, three hundred thirteen million, three hundred thirteen thousand, five hundred thirty-eight".