5666506651601 has 4 divisors (see below), whose sum is σ = 5676679913652. Its totient is φ = 5656333389552.

The previous prime is 5666506651583. The next prime is 5666506651627. The reversal of 5666506651601 is 1061566056665.

It is a happy number.

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 2767727995201 + 2898778656400 = 1663649^2 + 1702580^2 .

It is a cyclic number.

It is not a de Polignac number, because 5666506651601 - 2⁶ = 5666506651537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5666506651661) 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, 5086630190 + ... + 5086631303.

It is an arithmetic number, because the mean of its divisors is an integer number (1419169978413).

Almost surely, 2^{5666506651601} is an apocalyptic number.

It is an amenable number.

5666506651601 is a deficient number, since it is larger than the sum of its proper divisors (10173262051).

5666506651601 is a wasteful number, since it uses less digits than its factorization.

5666506651601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10173262050.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 5666506651601 in words is "five trillion, six hundred sixty-six billion, five hundred six million, six hundred fifty-one thousand, six hundred one".