861957334578 has 32 divisors (see below), whose sum is σ = 1727394096384. Its totient is φ = 286739408592.

The previous prime is 861957334529. The next prime is 861957334583. The reversal of 861957334578 is 875433759168.

It is a Curzon 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, 19627401 + ... + 19671267.

It is an arithmetic number, because the mean of its divisors is an integer number (53981065512).

Almost surely, 2^861957334578 is an apocalyptic number.

861957334578 is an abundant number, since it is smaller than the sum of its proper divisors (865436761806).

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

861957334578 is a wasteful number, since it uses less digits than its factorization.

861957334578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50406.

The product of its digits is 152409600, while the sum is 66.

The spelling of 861957334578 in words is "eight hundred sixty-one billion, nine hundred fifty-seven million, three hundred thirty-four thousand, five hundred seventy-eight".