15612020660 has 24 divisors (see below), whose sum is σ = 33915770280. Its totient is φ = 6029469824.

The previous prime is 15612020659. The next prime is 15612020663. The reversal of 15612020660 is 6602021651.

It can be written as a sum of positive squares in 4 ways, for example, as 17956 + 15612002704 = 134^2 + 124948^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15612020663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13458059 + ... + 13459218.

It is an arithmetic number, because the mean of its divisors is an integer number (1413157095).

Almost surely, 2^15612020660 is an apocalyptic number.

15612020660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15612020660 is an abundant number, since it is smaller than the sum of its proper divisors (18303749620).

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

15612020660 is a wasteful number, since it uses less digits than its factorization.

15612020660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26917315 (or 26917313 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

Subtracting from 15612020660 its reverse (6602021651), we obtain a palindrome (9009999009).

The spelling of 15612020660 in words is "fifteen billion, six hundred twelve million, twenty thousand, six hundred sixty".