665020600 has 48 divisors (see below), whose sum is σ = 1556094600. Its totient is φ = 264301440.

The previous prime is 665020591. The next prime is 665020613. The reversal of 665020600 is 6020566.

665020600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20811 + ... + 41989.

Almost surely, 2^665020600 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 665020600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778047300).

665020600 is an abundant number, since it is smaller than the sum of its proper divisors (891074000).

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

665020600 is a wasteful number, since it uses less digits than its factorization.

665020600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21352 (or 21343 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 665020600 is about 25787.9933302303. The cubic root of 665020600 is about 872.8608863321.

The spelling of 665020600 in words is "six hundred sixty-five million, twenty thousand, six hundred".