861818868964 has 9 divisors (see below), whose sum is σ = 1508186269891. Its totient is φ = 430908506140.

The previous prime is 861818868949. The next prime is 861818869001. The reversal of 861818868964 is 469868818168.

The square root of 861818868964 is 928342.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1624599 + ... + 2088769.

Almost surely, 2^861818868964 is an apocalyptic number.

861818868964 is the 928342-nd square number.

It is an amenable number.

861818868964 is a deficient number, since it is larger than the sum of its proper divisors (646367400927).

861818868964 is an frugal number, since it uses more digits than its factorization.

861818868964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928346 (or 464173 counting only the distinct ones).

The product of its digits is 254803968, while the sum is 73.

The spelling of 861818868964 in words is "eight hundred sixty-one billion, eight hundred eighteen million, eight hundred sixty-eight thousand, nine hundred sixty-four".