551665218511 has 8 divisors (see below), whose sum is σ = 601822327248. Its totient is φ = 501509064000.

The previous prime is 551665218497. The next prime is 551665218547. The reversal of 551665218511 is 115812566155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551665218511 - 2³⁷ = 414226265039 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 (551665218551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559601 + ... + 1880341.

It is an arithmetic number, because the mean of its divisors is an integer number (75227790906).

Almost surely, 2^551665218511 is an apocalyptic number.

551665218511 is a deficient number, since it is larger than the sum of its proper divisors (50157108737).

551665218511 is a wasteful number, since it uses less digits than its factorization.

551665218511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477113.

The product of its digits is 360000, while the sum is 46.

The spelling of 551665218511 in words is "five hundred fifty-one billion, six hundred sixty-five million, two hundred eighteen thousand, five hundred eleven".