15564900000 has 432 divisors, whose sum is σ = 55479761568. Its totient is φ = 3818880000.

The previous prime is 15564899983. The next prime is 15564900007. The reversal of 15564900000 is 946551.

It is a super-2 number, since 2×15564900000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (15564900007) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 50699847 + ... + 50700153.

It is an arithmetic number, because the mean of its divisors is an integer number (128425374).

Almost surely, 2^15564900000 is an apocalyptic number.

15564900000 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 15564900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27739880784).

15564900000 is an abundant number, since it is smaller than the sum of its proper divisors (39914861568).

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

15564900000 is an equidigital number, since it uses as much as digits as its factorization.

15564900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 15564900000 in words is "fifteen billion, five hundred sixty-four million, nine hundred thousand".