551231121132155 has 4 divisors (see below), whose sum is σ = 661477345358592. Its totient is φ = 440984896905720.

The previous prime is 551231121132151. The next prime is 551231121132173.

551231121132155 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 551231121132155 - 2² = 551231121132151 is a prime.

It is a super-2 number, since 2×551231121132155² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551231121132151) 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, 55123112113211 + ... + 55123112113220.

It is an arithmetic number, because the mean of its divisors is an integer number (165369336339648).

Almost surely, 2^{551231121132155} is an apocalyptic number.

551231121132155 is a deficient number, since it is larger than the sum of its proper divisors (110246224226437).

551231121132155 is a wasteful number, since it uses less digits than its factorization.

551231121132155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110246224226436.

The product of its digits is 45000, while the sum is 38.

The spelling of 551231121132155 in words is "five hundred fifty-one trillion, two hundred thirty-one billion, one hundred twenty-one million, one hundred thirty-two thousand, one hundred fifty-five".