165707838647 has 4 divisors (see below), whose sum is σ = 178454595480. Its totient is φ = 152961081816.

The previous prime is 165707838631. The next prime is 165707838661. The reversal of 165707838647 is 746838707561.

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

It is a cyclic number.

It is not a de Polignac number, because 165707838647 - 2⁴ = 165707838631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165707838647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165707838607) 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, 6373378397 + ... + 6373378422.

It is an arithmetic number, because the mean of its divisors is an integer number (44613648870).

Almost surely, 2^165707838647 is an apocalyptic number.

165707838647 is a deficient number, since it is larger than the sum of its proper divisors (12746756833).

165707838647 is a wasteful number, since it uses less digits than its factorization.

165707838647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12746756832.

The product of its (nonzero) digits is 47416320, while the sum is 62.

The spelling of 165707838647 in words is "one hundred sixty-five billion, seven hundred seven million, eight hundred thirty-eight thousand, six hundred forty-seven".