11115520504551 has 16 divisors (see below), whose sum is σ = 16506552855520. Its totient is φ = 7392745221120.

The previous prime is 11115520504547. The next prime is 11115520504607. The reversal of 11115520504551 is 15540502551111.

11115520504551 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 5 + 52 + 0 + 50 + 4 + 551 = 666.

It is not a de Polignac number, because 11115520504551 - 2² = 11115520504547 is a prime.

It is a super-2 number, since 2×11115520504551² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115520506551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488926810 + ... + 488949543.

It is an arithmetic number, because the mean of its divisors is an integer number (1031659553470).

Almost surely, 2^{11115520504551} is an apocalyptic number.

11115520504551 is a deficient number, since it is larger than the sum of its proper divisors (5391032350969).

11115520504551 is an equidigital number, since it uses as much as digits as its factorization.

11115520504551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977876783 (or 977876777 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 36.

The spelling of 11115520504551 in words is "eleven trillion, one hundred fifteen billion, five hundred twenty million, five hundred four thousand, five hundred fifty-one".