665612493 has 32 divisors (see below), whose sum is σ = 1093779456. Its totient is φ = 350612928.

The previous prime is 665612459. The next prime is 665612513. The reversal of 665612493 is 394216566.

It is not a de Polignac number, because 665612493 - 2¹⁰ = 665611469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665612413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295630 + ... + 297872.

It is an arithmetic number, because the mean of its divisors is an integer number (34180608).

Almost surely, 2^665612493 is an apocalyptic number.

It is an amenable number.

665612493 is a deficient number, since it is larger than the sum of its proper divisors (428166963).

665612493 is a wasteful number, since it uses less digits than its factorization.

665612493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353.

The product of its digits is 233280, while the sum is 42.

The square root of 665612493 is about 25799.4669130973. The cubic root of 665612493 is about 873.1197690635.

The spelling of 665612493 in words is "six hundred sixty-five million, six hundred twelve thousand, four hundred ninety-three".