15566216532 has 96 divisors (see below), whose sum is σ = 38836207872. Its totient is φ = 4835690496.

The previous prime is 15566216521. The next prime is 15566216537. The reversal of 15566216532 is 23561266551.

It is a super-2 number, since 2×15566216532² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15566216537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11945793 + ... + 11947095.

It is an arithmetic number, because the mean of its divisors is an integer number (404543832).

Almost surely, 2^15566216532 is an apocalyptic number.

15566216532 is a gapful number since it is divisible by the number (12) 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 15566216532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19418103936).

15566216532 is an abundant number, since it is smaller than the sum of its proper divisors (23269991340).

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

15566216532 is a wasteful number, since it uses less digits than its factorization.

15566216532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857 (or 1855 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The spelling of 15566216532 in words is "fifteen billion, five hundred sixty-six million, two hundred sixteen thousand, five hundred thirty-two".