15605857923 has 16 divisors (see below), whose sum is σ = 20964172320. Its totient is φ = 10326011904.

The previous prime is 15605857909. The next prime is 15605857937. The reversal of 15605857923 is 32975850651.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15605857909) and next prime (15605857937).

It is not a de Polignac number, because 15605857923 - 2⁹ = 15605857411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15605857823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183123 + ... + 254451.

It is an arithmetic number, because the mean of its divisors is an integer number (1310260770).

Almost surely, 2^15605857923 is an apocalyptic number.

15605857923 is a deficient number, since it is larger than the sum of its proper divisors (5358314397).

15605857923 is a wasteful number, since it uses less digits than its factorization.

15605857923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71878.

The product of its (nonzero) digits is 2268000, while the sum is 51.

The spelling of 15605857923 in words is "fifteen billion, six hundred five million, eight hundred fifty-seven thousand, nine hundred twenty-three".