15780939752 has 16 divisors (see below), whose sum is σ = 29591310660. Its totient is φ = 7889923584.

The previous prime is 15780939751. The next prime is 15780939781. The reversal of 15780939752 is 25793908751.

It can be written as a sum of positive squares in 2 ways, for example, as 15147209476 + 633730276 = 123074^2 + 25174^2 .

It is not an unprimeable number, because it can be changed into a prime (15780939751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71258 + ... + 191414.

Almost surely, 2^15780939752 is an apocalyptic number.

It is an amenable number.

15780939752 is a deficient number, since it is larger than the sum of its proper divisors (13810370908).

15780939752 is a wasteful number, since it uses less digits than its factorization.

15780939752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136580 (or 136576 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 15780939752 in words is "fifteen billion, seven hundred eighty million, nine hundred thirty-nine thousand, seven hundred fifty-two".