15612221660 has 192 divisors, whose sum is σ = 41104869120. Its totient is φ = 4859412480.

The previous prime is 15612221657. The next prime is 15612221671. The reversal of 15612221660 is 6612221651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7693526 + ... + 7695554.

It is an arithmetic number, because the mean of its divisors is an integer number (214087860).

Almost surely, 2^15612221660 is an apocalyptic number.

15612221660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15612221660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20552434560).

15612221660 is an abundant number, since it is smaller than the sum of its proper divisors (25492647460).

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

15612221660 is a wasteful number, since it uses less digits than its factorization.

15612221660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176 (or 2174 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

Subtracting from 15612221660 its reverse (6612221651), we obtain a palindrome (9000000009).

The spelling of 15612221660 in words is "fifteen billion, six hundred twelve million, two hundred twenty-one thousand, six hundred sixty".