665174816157 has 4 divisors (see below), whose sum is σ = 886899754880. Its totient is φ = 443449877436.

The previous prime is 665174816149. The next prime is 665174816167. The reversal of 665174816157 is 751618471566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665174816157 - 2³ = 665174816149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665174816097 and 665174816106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665174816147) 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, 110862469357 + ... + 110862469362.

It is an arithmetic number, because the mean of its divisors is an integer number (221724938720).

Almost surely, 2^665174816157 is an apocalyptic number.

It is an amenable number.

665174816157 is a deficient number, since it is larger than the sum of its proper divisors (221724938723).

665174816157 is a wasteful number, since it uses less digits than its factorization.

665174816157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221724938722.

The product of its digits is 8467200, while the sum is 57.

The spelling of 665174816157 in words is "six hundred sixty-five billion, one hundred seventy-four million, eight hundred sixteen thousand, one hundred fifty-seven".