665434850127 has 4 divisors (see below), whose sum is σ = 887246466840. Its totient is φ = 443623233416.

The previous prime is 665434850117. The next prime is 665434850149. The reversal of 665434850127 is 721058434566.

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 665434850127 - 2¹⁹ = 665434325839 is a prime.

It is a super-2 number, since 2×665434850127² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665434850127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665434850117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110905808352 + ... + 110905808357.

It is an arithmetic number, because the mean of its divisors is an integer number (221811616710).

Almost surely, 2^665434850127 is an apocalyptic number.

665434850127 is a deficient number, since it is larger than the sum of its proper divisors (221811616713).

665434850127 is a wasteful number, since it uses less digits than its factorization.

665434850127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221811616712.

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 665434850127 in words is "six hundred sixty-five billion, four hundred thirty-four million, eight hundred fifty thousand, one hundred twenty-seven".