111550161551 has 4 divisors (see below), whose sum is σ = 111551400192. Its totient is φ = 111548922912.

The previous prime is 111550161509. The next prime is 111550161589. The reversal of 111550161551 is 155161055111.

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 111550161551 - 2²⁶ = 111483052687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111550169551) 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, 472655 + ... + 668208.

It is an arithmetic number, because the mean of its divisors is an integer number (27887850048).

Almost surely, 2^111550161551 is an apocalyptic number.

111550161551 is a deficient number, since it is larger than the sum of its proper divisors (1238641).

111550161551 is an equidigital number, since it uses as much as digits as its factorization.

111550161551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238640.

The product of its (nonzero) digits is 3750, while the sum is 32.

The spelling of 111550161551 in words is "one hundred eleven billion, five hundred fifty million, one hundred sixty-one thousand, five hundred fifty-one".