665137144671 has 8 divisors (see below), whose sum is σ = 886990612224. Its totient is φ = 443354220120.

The previous prime is 665137144591. The next prime is 665137144723. The reversal of 665137144671 is 176441731566.

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

It is not a de Polignac number, because 665137144671 - 2³⁸ = 390259237727 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665137148671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17613745 + ... + 17651466.

It is an arithmetic number, because the mean of its divisors is an integer number (110873826528).

Almost surely, 2^665137144671 is an apocalyptic number.

665137144671 is a deficient number, since it is larger than the sum of its proper divisors (221853467553).

665137144671 is a wasteful number, since it uses less digits than its factorization.

665137144671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35271501.

The product of its digits is 2540160, while the sum is 51.

The spelling of 665137144671 in words is "six hundred sixty-five billion, one hundred thirty-seven million, one hundred forty-four thousand, six hundred seventy-one".