15565510000 has 50 divisors (see below), whose sum is σ = 37685680472. Its totient is φ = 6226200000.

The previous prime is 15565509991. The next prime is 15565510003. The reversal of 15565510000 is 1556551.

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15565510003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 768276 + ... + 788275.

Almost surely, 2^15565510000 is an apocalyptic number.

15565510000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15565510000 is an abundant number, since it is smaller than the sum of its proper divisors (22120170472).

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

15565510000 is an equidigital number, since it uses as much as digits as its factorization.

15565510000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556579 (or 1556558 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

15565510000 divided by its reverse (1556551) gives a 4-th power (10000 = 10⁴).

The spelling of 15565510000 in words is "fifteen billion, five hundred sixty-five million, five hundred ten thousand".