5618917581 has 16 divisors (see below), whose sum is σ = 7633320960. Its totient is φ = 3675812400.

The previous prime is 5618917567. The next prime is 5618917597. The reversal of 5618917581 is 1857198165.

It is not a de Polignac number, because 5618917581 - 2¹⁵ = 5618884813 is a prime.

It is a super-2 number, since 2×5618917581² = 63144469564141783122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5618917501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34095 + ... + 111356.

It is an arithmetic number, because the mean of its divisors is an integer number (477082560).

Almost surely, 2^5618917581 is an apocalyptic number.

It is an amenable number.

5618917581 is a deficient number, since it is larger than the sum of its proper divisors (2014403379).

5618917581 is a wasteful number, since it uses less digits than its factorization.

5618917581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145696.

The product of its digits is 604800, while the sum is 51.

The square root of 5618917581 is about 74959.4395723447. The cubic root of 5618917581 is about 1777.8053983771.

The spelling of 5618917581 in words is "five billion, six hundred eighteen million, nine hundred seventeen thousand, five hundred eighty-one".