551243135555311 has 4 divisors (see below), whose sum is σ = 551449053800632. Its totient is φ = 551037217309992.

The previous prime is 551243135555263. The next prime is 551243135555423. The reversal of 551243135555311 is 113555531342155.

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 551243135555311 - 2²¹ = 551243133458159 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 (551243135550311) 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, 102959118645 + ... + 102959123998.

It is an arithmetic number, because the mean of its divisors is an integer number (137862263450158).

Almost surely, 2^{551243135555311} is an apocalyptic number.

551243135555311 is a deficient number, since it is larger than the sum of its proper divisors (205918245321).

551243135555311 is a wasteful number, since it uses less digits than its factorization.

551243135555311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205918245320.

The product of its digits is 3375000, while the sum is 49.

Adding to 551243135555311 its reverse (113555531342155), we get a palindrome (664798666897466).

The spelling of 551243135555311 in words is "five hundred fifty-one trillion, two hundred forty-three billion, one hundred thirty-five million, five hundred fifty-five thousand, three hundred eleven".