15666624020 has 24 divisors (see below), whose sum is σ = 32905076904. Its totient is φ = 6265665536.

The previous prime is 15666624007. The next prime is 15666624031. The reversal of 15666624020 is 2042666651.

It can be written as a sum of positive squares in 4 ways, for example, as 4516108804 + 11150515216 = 67202^2 + 105596^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76604 + ... + 192876.

It is an arithmetic number, because the mean of its divisors is an integer number (1371044871).

Almost surely, 2^15666624020 is an apocalyptic number.

15666624020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15666624020 is an abundant number, since it is smaller than the sum of its proper divisors (17238452884).

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

15666624020 is a wasteful number, since it uses less digits than its factorization.

15666624020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123019 (or 123017 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 15666624020 in words is "fifteen billion, six hundred sixty-six million, six hundred twenty-four thousand, twenty".