15797978234 has 4 divisors (see below), whose sum is σ = 23696967354. Its totient is φ = 7898989116.

The previous prime is 15797978123. The next prime is 15797978243. The reversal of 15797978234 is 43287979751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15215962609 + 582015625 = 123353^2 + 24125^2 .

It is a super-2 number, since 2×15797978234² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3949494557 + ... + 3949494560.

Almost surely, 2^15797978234 is an apocalyptic number.

15797978234 is a deficient number, since it is larger than the sum of its proper divisors (7898989120).

15797978234 is an equidigital number, since it uses as much as digits as its factorization.

15797978234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7898989119.

The product of its digits is 26671680, while the sum is 62.

The spelling of 15797978234 in words is "fifteen billion, seven hundred ninety-seven million, nine hundred seventy-eight thousand, two hundred thirty-four".