551618863 has 4 divisors (see below), whose sum is σ = 551851200. Its totient is φ = 551386528.

The previous prime is 551618857. The next prime is 551618891. The reversal of 551618863 is 368816155.

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 551618863 - 2¹³ = 551610671 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 (551618813) 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, 112570 + ... + 117367.

It is an arithmetic number, because the mean of its divisors is an integer number (137962800).

Almost surely, 2^551618863 is an apocalyptic number.

551618863 is a deficient number, since it is larger than the sum of its proper divisors (232337).

551618863 is a wasteful number, since it uses less digits than its factorization.

551618863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232336.

The product of its digits is 172800, while the sum is 43.

The square root of 551618863 is about 23486.5677143341. The cubic root of 551618863 is about 820.1243431308.

The spelling of 551618863 in words is "five hundred fifty-one million, six hundred eighteen thousand, eight hundred sixty-three".