666497965 has 8 divisors (see below), whose sum is σ = 914054400. Its totient is φ = 457027152.

The previous prime is 666497917. The next prime is 666498011. The reversal of 666497965 is 569794666.

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

It is a cyclic number.

It is not a de Polignac number, because 666497965 - 2¹³ = 666489773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9521365 + ... + 9521434.

It is an arithmetic number, because the mean of its divisors is an integer number (114256800).

Almost surely, 2^666497965 is an apocalyptic number.

It is an amenable number.

666497965 is a deficient number, since it is larger than the sum of its proper divisors (247556435).

666497965 is a wasteful number, since it uses less digits than its factorization.

666497965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19042811.

The product of its digits is 14696640, while the sum is 58.

The square root of 666497965 is about 25816.6218742887. The cubic root of 666497965 is about 873.5067712797.

The spelling of 666497965 in words is "six hundred sixty-six million, four hundred ninety-seven thousand, nine hundred sixty-five".