815609902112 has 12 divisors (see below), whose sum is σ = 1605731994846. Its totient is φ = 407804951040.

The previous prime is 815609901971. The next prime is 815609902171. The reversal of 815609902112 is 211209906518.

It can be written as a sum of positive squares in only one way, i.e., 706601635216 + 109008266896 = 840596^2 + 330164^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12743904689 + ... + 12743904752.

Almost surely, 2^815609902112 is an apocalyptic number.

It is an amenable number.

815609902112 is a deficient number, since it is larger than the sum of its proper divisors (790122092734).

815609902112 is a wasteful number, since it uses less digits than its factorization.

815609902112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25487809451 (or 25487809443 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 815609902112 in words is "eight hundred fifteen billion, six hundred nine million, nine hundred two thousand, one hundred twelve".