11500515212055 has 32 divisors (see below), whose sum is σ = 18743230033920. Its totient is φ = 6019812074880.

The previous prime is 11500515212033. The next prime is 11500515212077. The reversal of 11500515212055 is 55021251500511.

It is an interprime number because it is at equal distance from previous prime (11500515212033) and next prime (11500515212077).

It is not a de Polignac number, because 11500515212055 - 2¹⁵ = 11500515179287 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10056951 + ... + 11141960.

It is an arithmetic number, because the mean of its divisors is an integer number (585725938560).

Almost surely, 2^{11500515212055} is an apocalyptic number.

11500515212055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11500515212055 is a deficient number, since it is larger than the sum of its proper divisors (7242714821865).

11500515212055 is a wasteful number, since it uses less digits than its factorization.

11500515212055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21199591.

The product of its (nonzero) digits is 12500, while the sum is 33.

Adding to 11500515212055 its reverse (55021251500511), we get a palindrome (66521766712566).

The spelling of 11500515212055 in words is "eleven trillion, five hundred billion, five hundred fifteen million, two hundred twelve thousand, fifty-five".