815557463916 has 24 divisors (see below), whose sum is σ = 2049349525104. Its totient is φ = 250940758080.

The previous prime is 815557463909. The next prime is 815557464011. The reversal of 815557463916 is 619364755518.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 815557463916.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613966075 + ... + 2613966386.

It is an arithmetic number, because the mean of its divisors is an integer number (85389563546).

Almost surely, 2^815557463916 is an apocalyptic number.

It is an amenable number.

815557463916 is an abundant number, since it is smaller than the sum of its proper divisors (1233792061188).

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

815557463916 is a wasteful number, since it uses less digits than its factorization.

815557463916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227932481 (or 5227932479 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 60.

The spelling of 815557463916 in words is "eight hundred fifteen billion, five hundred fifty-seven million, four hundred sixty-three thousand, nine hundred sixteen".