815970163778 has 96 divisors (see below), whose sum is σ = 1577014137216. Its totient is φ = 313051200000.

The previous prime is 815970163733. The next prime is 815970163781. The reversal of 815970163778 is 877361079518.

It is a super-2 number, since 2×815970163778² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 815970163778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67423928 + ... + 67436028.

It is an arithmetic number, because the mean of its divisors is an integer number (16427230596).

Almost surely, 2^815970163778 is an apocalyptic number.

815970163778 is a deficient number, since it is larger than the sum of its proper divisors (761043973438).

815970163778 is a wasteful number, since it uses less digits than its factorization.

815970163778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080 (or 13073 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 62.

The spelling of 815970163778 in words is "eight hundred fifteen billion, nine hundred seventy million, one hundred sixty-three thousand, seven hundred seventy-eight".