11515204515550 has 48 divisors (see below), whose sum is σ = 21921389119872. Its totient is φ = 4497935349600.

The previous prime is 11515204515497. The next prime is 11515204515553. The reversal of 11515204515550 is 5551540251511.

It is a super-2 number, since 2×11515204515550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11515204515553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8830777 + ... + 10050523.

It is an arithmetic number, because the mean of its divisors is an integer number (456695606664).

Almost surely, 2^{11515204515550} is an apocalyptic number.

11515204515550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11515204515550 is a deficient number, since it is larger than the sum of its proper divisors (10406184604322).

11515204515550 is a wasteful number, since it uses less digits than its factorization.

11515204515550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224193 (or 1224188 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 40.

The spelling of 11515204515550 in words is "eleven trillion, five hundred fifteen billion, two hundred four million, five hundred fifteen thousand, five hundred fifty".