47564820665 has 4 divisors (see below), whose sum is σ = 57077784804. Its totient is φ = 38051856528.

The previous prime is 47564820661. The next prime is 47564820671. The reversal of 47564820665 is 56602846574.

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 29392702249 + 18172118416 = 171443^2 + 134804^2 .

It is a cyclic number.

It is not a de Polignac number, because 47564820665 - 2² = 47564820661 is a prime.

It is a super-2 number, since 2×47564820665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47564820661) 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, 4756482062 + ... + 4756482071.

It is an arithmetic number, because the mean of its divisors is an integer number (14269446201).

Almost surely, 2^47564820665 is an apocalyptic number.

It is an amenable number.

47564820665 is a deficient number, since it is larger than the sum of its proper divisors (9512964139).

47564820665 is an equidigital number, since it uses as much as digits as its factorization.

47564820665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9512964138.

The product of its (nonzero) digits is 9676800, while the sum is 53.

The spelling of 47564820665 in words is "forty-seven billion, five hundred sixty-four million, eight hundred twenty thousand, six hundred sixty-five".