515155015550 has 48 divisors (see below), whose sum is σ = 1096554756480. Its totient is φ = 176385483360.

The previous prime is 515155015547. The next prime is 515155015561. The reversal of 515155015550 is 55510551515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 737204 + ... + 1254503.

It is an arithmetic number, because the mean of its divisors is an integer number (22844890760).

Almost surely, 2^515155015550 is an apocalyptic number.

515155015550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

515155015550 is an abundant number, since it is smaller than the sum of its proper divisors (581399740930).

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

515155015550 is a wasteful number, since it uses less digits than its factorization.

515155015550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992465 (or 1992460 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 38.

The spelling of 515155015550 in words is "five hundred fifteen billion, one hundred fifty-five million, fifteen thousand, five hundred fifty".