665131008851 has 4 divisors (see below), whose sum is σ = 665141325600. Its totient is φ = 665120692104.

The previous prime is 665131008847. The next prime is 665131008863. The reversal of 665131008851 is 158800131566.

It is a happy number.

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 665131008851 - 2² = 665131008847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665191008851) 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, 5061056 + ... + 5190813.

It is an arithmetic number, because the mean of its divisors is an integer number (166285331400).

Almost surely, 2^665131008851 is an apocalyptic number.

665131008851 is a deficient number, since it is larger than the sum of its proper divisors (10316749).

665131008851 is a wasteful number, since it uses less digits than its factorization.

665131008851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316748.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 665131008851 in words is "six hundred sixty-five billion, one hundred thirty-one million, eight thousand, eight hundred fifty-one".