165407217497 has 8 divisors (see below), whose sum is σ = 165744214080. Its totient is φ = 165070478160.

The previous prime is 165407217461. The next prime is 165407217509. The reversal of 165407217497 is 794712704561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165407217497 - 2⁶ = 165407217433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165407217697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1250204 + ... + 1376162.

It is an arithmetic number, because the mean of its divisors is an integer number (20718026760).

Almost surely, 2^165407217497 is an apocalyptic number.

It is an amenable number.

165407217497 is a deficient number, since it is larger than the sum of its proper divisors (336996583).

165407217497 is a wasteful number, since it uses less digits than its factorization.

165407217497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128623.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 165407217497 in words is "one hundred sixty-five billion, four hundred seven million, two hundred seventeen thousand, four hundred ninety-seven".