15655556020 has 96 divisors (see below), whose sum is σ = 37541151648. Its totient is φ = 5432819712.

The previous prime is 15655555957. The next prime is 15655556023. The reversal of 15655556020 is 2065555651.

15655556020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 265168656 + 15390387364 = 16284^2 + 124058^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15655556023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3785874 + ... + 3790006.

It is an arithmetic number, because the mean of its divisors is an integer number (391053663).

Almost surely, 2^15655556020 is an apocalyptic number.

15655556020 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 15655556020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18770575824).

15655556020 is an abundant number, since it is smaller than the sum of its proper divisors (21885595628).

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

15655556020 is a wasteful number, since it uses less digits than its factorization.

15655556020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029 (or 5027 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 40.

The spelling of 15655556020 in words is "fifteen billion, six hundred fifty-five million, five hundred fifty-six thousand, twenty".