5667811581 has 4 divisors (see below), whose sum is σ = 7557082112. Its totient is φ = 3778541052.

The previous prime is 5667811529. The next prime is 5667811607. The reversal of 5667811581 is 1851187665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5667811581 - 2⁶ = 5667811517 is a prime.

It is a super-2 number, since 2×5667811581² = 64248176235435439122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5667811581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5667811481) 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, 944635261 + ... + 944635266.

It is an arithmetic number, because the mean of its divisors is an integer number (1889270528).

Almost surely, 2^5667811581 is an apocalyptic number.

It is an amenable number.

5667811581 is a deficient number, since it is larger than the sum of its proper divisors (1889270531).

5667811581 is a wasteful number, since it uses less digits than its factorization.

5667811581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889270530.

The product of its digits is 403200, while the sum is 48.

The square root of 5667811581 is about 75284.8695356511. The cubic root of 5667811581 is about 1782.9471419910.

The spelling of 5667811581 in words is "five billion, six hundred sixty-seven million, eight hundred eleven thousand, five hundred eighty-one".