165571370507 has 4 divisors (see below), whose sum is σ = 167667210720. Its totient is φ = 163475530296.

The previous prime is 165571370473. The next prime is 165571370509. The reversal of 165571370507 is 705073175561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705073175561 = 41 ⋅17196906721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165571370507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165571370509) 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, 1047919988 + ... + 1047920145.

It is an arithmetic number, because the mean of its divisors is an integer number (41916802680).

Almost surely, 2^165571370507 is an apocalyptic number.

165571370507 is a deficient number, since it is larger than the sum of its proper divisors (2095840213).

165571370507 is an equidigital number, since it uses as much as digits as its factorization.

165571370507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095840212.

The product of its (nonzero) digits is 771750, while the sum is 47.

The spelling of 165571370507 in words is "one hundred sixty-five billion, five hundred seventy-one million, three hundred seventy thousand, five hundred seven".