15606691939 has 24 divisors (see below), whose sum is σ = 16467436800. Its totient is φ = 14772831360.

The previous prime is 15606691937. The next prime is 15606691963. The reversal of 15606691939 is 93919660651.

15606691939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15606691939 - 2¹ = 15606691937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15606691939.

It is not an unprimeable number, because it can be changed into a prime (15606691931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38157967 + ... + 38158375.

It is an arithmetic number, because the mean of its divisors is an integer number (686143200).

Almost surely, 2^15606691939 is an apocalyptic number.

15606691939 is a deficient number, since it is larger than the sum of its proper divisors (860744861).

15606691939 is an equidigital number, since it uses as much as digits as its factorization.

15606691939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 55.

The spelling of 15606691939 in words is "fifteen billion, six hundred six million, six hundred ninety-one thousand, nine hundred thirty-nine".