665715402 has 64 divisors (see below), whose sum is σ = 1622332800. Its totient is φ = 200672640.

The previous prime is 665715371. The next prime is 665715403. The reversal of 665715402 is 204517566.

It is a happy number.

665715402 is a `hidden beast` number, since 66 + 57 + 1 + 540 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (665715403) 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, 114174 + ... + 119862.

It is an arithmetic number, because the mean of its divisors is an integer number (25348950).

Almost surely, 2^665715402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665715402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811166400).

665715402 is an abundant number, since it is smaller than the sum of its proper divisors (956617398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665715402 is a wasteful number, since it uses less digits than its factorization.

665715402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908 (or 5902 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 665715402 is about 25801.4612376896. The cubic root of 665715402 is about 873.1647638380.

The spelling of 665715402 in words is "six hundred sixty-five million, seven hundred fifteen thousand, four hundred two".