15798778612 has 6 divisors (see below), whose sum is σ = 27647862578. Its totient is φ = 7899389304.

The previous prime is 15798778573. The next prime is 15798778627. The reversal of 15798778612 is 21687789751.

It can be written as a sum of positive squares in only one way, i.e., 15696080656 + 102697956 = 125284^2 + 10134^2 .

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, 1974847323 + ... + 1974847330.

Almost surely, 2^15798778612 is an apocalyptic number.

It is an amenable number.

15798778612 is a deficient number, since it is larger than the sum of its proper divisors (11849083966).

15798778612 is a wasteful number, since it uses less digits than its factorization.

15798778612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949694657 (or 3949694655 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 61.

The spelling of 15798778612 in words is "fifteen billion, seven hundred ninety-eight million, seven hundred seventy-eight thousand, six hundred twelve".