11251205155 has 4 divisors (see below), whose sum is σ = 13501446192. Its totient is φ = 9000964120.

The previous prime is 11251205137. The next prime is 11251205177. The reversal of 11251205155 is 55150215211.

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

It is not a de Polignac number, because 11251205155 - 2⁵ = 11251205123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125120511 + ... + 1125120520.

It is an arithmetic number, because the mean of its divisors is an integer number (3375361548).

Almost surely, 2^11251205155 is an apocalyptic number.

11251205155 is a deficient number, since it is larger than the sum of its proper divisors (2250241037).

11251205155 is an equidigital number, since it uses as much as digits as its factorization.

11251205155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250241036.

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 11251205155 in words is "eleven billion, two hundred fifty-one million, two hundred five thousand, one hundred fifty-five".