15621431676 has 12 divisors (see below), whose sum is σ = 36450007272. Its totient is φ = 5207143888.

The previous prime is 15621431671. The next prime is 15621431677. The reversal of 15621431676 is 67613412651.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15621431671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650892975 + ... + 650892998.

It is an arithmetic number, because the mean of its divisors is an integer number (3037500606).

Almost surely, 2^15621431676 is an apocalyptic number.

It is an amenable number.

15621431676 is an abundant number, since it is smaller than the sum of its proper divisors (20828575596).

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

15621431676 is a wasteful number, since it uses less digits than its factorization.

15621431676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301785980 (or 1301785978 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The spelling of 15621431676 in words is "fifteen billion, six hundred twenty-one million, four hundred thirty-one thousand, six hundred seventy-six".