665912797 has 16 divisors (see below), whose sum is σ = 771325632. Its totient is φ = 568177920.

The previous prime is 665912773. The next prime is 665912809. The reversal of 665912797 is 797219566.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665912797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665912747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64978 + ... + 74524.

It is an arithmetic number, because the mean of its divisors is an integer number (48207852).

Almost surely, 2^665912797 is an apocalyptic number.

It is an amenable number.

665912797 is a deficient number, since it is larger than the sum of its proper divisors (105412835).

665912797 is a wasteful number, since it uses less digits than its factorization.

665912797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9948.

The product of its digits is 1428840, while the sum is 52.

The square root of 665912797 is about 25805.2862220127. The cubic root of 665912797 is about 873.2510576332.

The spelling of 665912797 in words is "six hundred sixty-five million, nine hundred twelve thousand, seven hundred ninety-seven".