551812218155 has 24 divisors (see below), whose sum is σ = 731655735552. Its totient is φ = 399216752000.

The previous prime is 551812218119. The next prime is 551812218161.

551812218155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 551812218155 - 2²⁶ = 551745109291 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2272106 + ... + 2503215.

It is an arithmetic number, because the mean of its divisors is an integer number (30485655648).

Almost surely, 2^551812218155 is an apocalyptic number.

551812218155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

551812218155 is a deficient number, since it is larger than the sum of its proper divisors (179843517397).

551812218155 is a wasteful number, since it uses less digits than its factorization.

551812218155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775539 (or 4775528 counting only the distinct ones).

The product of its digits is 160000, while the sum is 44.

It can be divided in two parts, 551812 and 218155, that added together give a palindrome (769967).

The spelling of 551812218155 in words is "five hundred fifty-one billion, eight hundred twelve million, two hundred eighteen thousand, one hundred fifty-five".