115564117551 has 4 divisors (see below), whose sum is σ = 154085490072. Its totient is φ = 77042745032.

The previous prime is 115564117547. The next prime is 115564117577. The reversal of 115564117551 is 155711465511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115564117551 - 2² = 115564117547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115564117511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19260686256 + ... + 19260686261.

It is an arithmetic number, because the mean of its divisors is an integer number (38521372518).

Almost surely, 2^115564117551 is an apocalyptic number.

115564117551 is a deficient number, since it is larger than the sum of its proper divisors (38521372521).

115564117551 is an equidigital number, since it uses as much as digits as its factorization.

115564117551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38521372520.

The product of its digits is 105000, while the sum is 42.

The spelling of 115564117551 in words is "one hundred fifteen billion, five hundred sixty-four million, one hundred seventeen thousand, five hundred fifty-one".