6566426761 has 4 divisors (see below), whose sum is σ = 6792855300. Its totient is φ = 6339998224.

The previous prime is 6566426759. The next prime is 6566426767. The reversal of 6566426761 is 1676246656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5184000000 + 1382426761 = 72000^2 + 37181^2 .

It is a cyclic number.

It is not a de Polignac number, because 6566426761 - 2¹ = 6566426759 is a prime.

It is a super-2 number, since 2×6566426761² = 86235920815153902242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6566426767) 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, 113214226 + ... + 113214283.

It is an arithmetic number, because the mean of its divisors is an integer number (1698213825).

Almost surely, 2^6566426761 is an apocalyptic number.

It is an amenable number.

6566426761 is a deficient number, since it is larger than the sum of its proper divisors (226428539).

6566426761 is a wasteful number, since it uses less digits than its factorization.

6566426761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226428538.

The product of its digits is 2177280, while the sum is 49.

The square root of 6566426761 is about 81033.4916006956. The cubic root of 6566426761 is about 1872.5914447235.

The spelling of 6566426761 in words is "six billion, five hundred sixty-six million, four hundred twenty-six thousand, seven hundred sixty-one".