665202040 has 32 divisors (see below), whose sum is σ = 1533213360. Its totient is φ = 259590400.

The previous prime is 665202023. The next prime is 665202047. The reversal of 665202040 is 40202566.

It is a junction number, because it is equal to n+sod(n) for n = 665201996 and 665202014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665202047) 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, 201166 + ... + 204445.

Almost surely, 2^665202040 is an apocalyptic number.

It is an amenable number.

665202040 is an abundant number, since it is smaller than the sum of its proper divisors (868011320).

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

665202040 is a wasteful number, since it uses less digits than its factorization.

665202040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405663 (or 405659 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 665202040 is about 25791.5110065308. The cubic root of 665202040 is about 872.9402610554.

The spelling of 665202040 in words is "six hundred sixty-five million, two hundred two thousand, forty".