15666074138 has 32 divisors (see below), whose sum is σ = 27717463872. Its totient is φ = 6546960000.

The previous prime is 15666074131. The next prime is 15666074147. The reversal of 15666074138 is 83147066651.

It is a junction number, because it is equal to n+sod(n) for n = 15666074092 and 15666074101.

It is not an unprimeable number, because it can be changed into a prime (15666074131) 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, 37331 + ... + 180902.

It is an arithmetic number, because the mean of its divisors is an integer number (866170746).

Almost surely, 2^15666074138 is an apocalyptic number.

15666074138 is a deficient number, since it is larger than the sum of its proper divisors (12051389734).

15666074138 is a wasteful number, since it uses less digits than its factorization.

15666074138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218510.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 15666074138 in words is "fifteen billion, six hundred sixty-six million, seventy-four thousand, one hundred thirty-eight".