15685091642 has 16 divisors (see below), whose sum is σ = 25672185792. Its totient is φ = 7128011520.

The previous prime is 15685091567. The next prime is 15685091647. The reversal of 15685091642 is 24619058651.

15685091642 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (15685091647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26138 + ... + 179034.

It is an arithmetic number, because the mean of its divisors is an integer number (1604511612).

Almost surely, 2^15685091642 is an apocalyptic number.

15685091642 is a deficient number, since it is larger than the sum of its proper divisors (9987094150).

15685091642 is a wasteful number, since it uses less digits than its factorization.

15685091642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157573.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 15685091642 in words is "fifteen billion, six hundred eighty-five million, ninety-one thousand, six hundred forty-two".