665777897327 has 4 divisors (see below), whose sum is σ = 665785926816. Its totient is φ = 665769867840.

The previous prime is 665777897261. The next prime is 665777897339. The reversal of 665777897327 is 723798777566.

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 665777897327 - 2²⁸ = 665509461871 is a prime.

It is a super-2 number, since 2×665777897327² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665777897527) 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, 3889058 + ... + 4056639.

It is an arithmetic number, because the mean of its divisors is an integer number (166446481704).

Almost surely, 2^665777897327 is an apocalyptic number.

665777897327 is a deficient number, since it is larger than the sum of its proper divisors (8029489).

665777897327 is an equidigital number, since it uses as much as digits as its factorization.

665777897327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029488.

The product of its digits is 1306912320, while the sum is 74.

The spelling of 665777897327 in words is "six hundred sixty-five billion, seven hundred seventy-seven million, eight hundred ninety-seven thousand, three hundred twenty-seven".