55121125251 has 4 divisors (see below), whose sum is σ = 73494833672. Its totient is φ = 36747416832.

The previous prime is 55121125247. The next prime is 55121125271. The reversal of 55121125251 is 15252112155.

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

It is not a de Polignac number, because 55121125251 - 2² = 55121125247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55121125271) 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, 9186854206 + ... + 9186854211.

It is an arithmetic number, because the mean of its divisors is an integer number (18373708418).

Almost surely, 2^55121125251 is an apocalyptic number.

55121125251 is a deficient number, since it is larger than the sum of its proper divisors (18373708421).

55121125251 is a wasteful number, since it uses less digits than its factorization.

55121125251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18373708420.

The product of its digits is 5000, while the sum is 30.

The spelling of 55121125251 in words is "fifty-five billion, one hundred twenty-one million, one hundred twenty-five thousand, two hundred fifty-one".