816889864088 has 8 divisors (see below), whose sum is σ = 1531668495180. Its totient is φ = 408444932040.

The previous prime is 816889864079. The next prime is 816889864093. The reversal of 816889864088 is 880468988618.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×816889864088² (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 as a sum of consecutive naturals, namely, 51055616498 + ... + 51055616513.

Almost surely, 2^816889864088 is an apocalyptic number.

It is an amenable number.

816889864088 is a deficient number, since it is larger than the sum of its proper divisors (714778631092).

816889864088 is a wasteful number, since it uses less digits than its factorization.

816889864088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102111233017 (or 102111233013 counting only the distinct ones).

The product of its (nonzero) digits is 339738624, while the sum is 74.

The spelling of 816889864088 in words is "eight hundred sixteen billion, eight hundred eighty-nine million, eight hundred sixty-four thousand, eighty-eight".