5266565661 has 16 divisors (see below), whose sum is σ = 8220981888. Its totient is φ = 2936064000.

The previous prime is 5266565657. The next prime is 5266565663. The reversal of 5266565661 is 1665656625.

5266565661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5266565661 - 2² = 5266565657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5266565661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5266565663) 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, 3057540 + ... + 3059261.

It is an arithmetic number, because the mean of its divisors is an integer number (513811368).

Almost surely, 2^5266565661 is an apocalyptic number.

It is an amenable number.

5266565661 is a deficient number, since it is larger than the sum of its proper divisors (2954416227).

5266565661 is a wasteful number, since it uses less digits than its factorization.

5266565661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116852.

The product of its digits is 1944000, while the sum is 48.

The square root of 5266565661 is about 72571.1076186660. The cubic root of 5266565661 is about 1739.8394246718.

The spelling of 5266565661 in words is "five billion, two hundred sixty-six million, five hundred sixty-five thousand, six hundred sixty-one".