665689392 has 120 divisors (see below), whose sum is σ = 1903449600. Its totient is φ = 217137024.

The previous prime is 665689373. The next prime is 665689393. The reversal of 665689392 is 293986566.

It is not an unprimeable number, because it can be changed into a prime (665689393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1854109 + ... + 1854467.

It is an arithmetic number, because the mean of its divisors is an integer number (15862080).

Almost surely, 2^665689392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665689392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951724800).

665689392 is an abundant number, since it is smaller than the sum of its proper divisors (1237760208).

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

665689392 is a wasteful number, since it uses less digits than its factorization.

665689392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 606 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 665689392 is about 25800.9571915462. The cubic root of 665689392 is about 873.1533919558.

The spelling of 665689392 in words is "six hundred sixty-five million, six hundred eighty-nine thousand, three hundred ninety-two".