165664072947 has 4 divisors (see below), whose sum is σ = 220885430600. Its totient is φ = 110442715296.

The previous prime is 165664072933. The next prime is 165664072967. The reversal of 165664072947 is 749270466561.

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

It is not a de Polignac number, because 165664072947 - 2¹⁴ = 165664056563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165664072907) 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, 27610678822 + ... + 27610678827.

It is an arithmetic number, because the mean of its divisors is an integer number (55221357650).

Almost surely, 2^165664072947 is an apocalyptic number.

165664072947 is a deficient number, since it is larger than the sum of its proper divisors (55221357653).

165664072947 is an equidigital number, since it uses as much as digits as its factorization.

165664072947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55221357652.

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 165664072947 in words is "one hundred sixty-five billion, six hundred sixty-four million, seventy-two thousand, nine hundred forty-seven".