15530666556 has 96 divisors (see below), whose sum is σ = 38839223808. Its totient is φ = 4818401280.

The previous prime is 15530666527. The next prime is 15530666573. The reversal of 15530666556 is 65566603551.

It is a super-2 number, since 2×15530666556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3332580 + ... + 3337236.

It is an arithmetic number, because the mean of its divisors is an integer number (404575248).

Almost surely, 2^15530666556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15530666556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19419611904).

15530666556 is an abundant number, since it is smaller than the sum of its proper divisors (23308557252).

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

15530666556 is a wasteful number, since it uses less digits than its factorization.

15530666556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 48.

The spelling of 15530666556 in words is "fifteen billion, five hundred thirty million, six hundred sixty-six thousand, five hundred fifty-six".