665214797 has 8 divisors (see below), whose sum is σ = 717046680. Its totient is φ = 613477440.

The previous prime is 665214769. The next prime is 665214799. The reversal of 665214797 is 797412566.

It can be written as a sum of positive squares in 4 ways, for example, as 95628841 + 569585956 = 9779^2 + 23866^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665214797 is a prime.

It is a super-2 number, since 2×665214797² = 885021452295502418, which 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 (665214799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8654 + ... + 37487.

It is an arithmetic number, because the mean of its divisors is an integer number (89630835).

Almost surely, 2^665214797 is an apocalyptic number.

It is an amenable number.

665214797 is a deficient number, since it is larger than the sum of its proper divisors (51831883).

665214797 is a wasteful number, since it uses less digits than its factorization.

665214797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47263.

The product of its digits is 635040, while the sum is 47.

The square root of 665214797 is about 25791.7583153999. The cubic root of 665214797 is about 872.9458413288.

The spelling of 665214797 in words is "six hundred sixty-five million, two hundred fourteen thousand, seven hundred ninety-seven".