15664803840 has 1040 divisors, whose sum is σ = 68505592320. Its totient is φ = 3344302080.

The previous prime is 15664803839. The next prime is 15664803851. The reversal of 15664803840 is 4830846651.

15664803840 is a `hidden beast` number, since 1 + 566 + 4 + 8 + 0 + 3 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 220631005 + ... + 220631075.

Almost surely, 2^15664803840 is an apocalyptic number.

15664803840 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 15664803840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34252796160).

15664803840 is an abundant number, since it is smaller than the sum of its proper divisors (52840788480).

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

15664803840 is an equidigital number, since it uses as much as digits as its factorization.

15664803840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 15664803840 in words is "fifteen billion, six hundred sixty-four million, eight hundred three thousand, eight hundred forty".