15215506550 has 24 divisors (see below), whose sum is σ = 28304132616. Its totient is φ = 6085495040.

The previous prime is 15215506529. The next prime is 15215506567. The reversal of 15215506550 is 5560551251.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 15215506550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 727337 + ... + 747963.

It is an arithmetic number, because the mean of its divisors is an integer number (1179338859).

Almost surely, 2^15215506550 is an apocalyptic number.

15215506550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15215506550 is a deficient number, since it is larger than the sum of its proper divisors (13088626066).

15215506550 is a wasteful number, since it uses less digits than its factorization.

15215506550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35392 (or 35387 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 35.

The spelling of 15215506550 in words is "fifteen billion, two hundred fifteen million, five hundred six thousand, five hundred fifty".