15666122124 has 36 divisors (see below), whose sum is σ = 39678322320. Its totient is φ = 5211775200.

The previous prime is 15666122111. The next prime is 15666122167. The reversal of 15666122124 is 42122166651.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409152 + ... + 445799.

It is an arithmetic number, because the mean of its divisors is an integer number (1102175620).

Almost surely, 2^15666122124 is an apocalyptic number.

It is an amenable number.

15666122124 is an abundant number, since it is smaller than the sum of its proper divisors (24012200196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15666122124 is a wasteful number, since it uses less digits than its factorization.

15666122124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855470 (or 855465 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

Adding to 15666122124 its reverse (42122166651), we get a palindrome (57788288775).

The spelling of 15666122124 in words is "fifteen billion, six hundred sixty-six million, one hundred twenty-two thousand, one hundred twenty-four".