665456433700 has 72 divisors (see below), whose sum is σ = 1529761276512. Its totient is φ = 250397422080.

The previous prime is 665456433689. The next prime is 665456433833. The reversal of 665456433700 is 7334654566.

It is a super-5 number, since 5×665456433700⁵ (a number of 60 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3279399 + ... + 3476401.

It is an arithmetic number, because the mean of its divisors is an integer number (21246684396).

Almost surely, 2^665456433700 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 665456433700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764880638256).

665456433700 is an abundant number, since it is smaller than the sum of its proper divisors (864304842812).

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

665456433700 is a wasteful number, since it uses less digits than its factorization.

665456433700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199021 (or 199014 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 49.

The spelling of 665456433700 in words is "six hundred sixty-five billion, four hundred fifty-six million, four hundred thirty-three thousand, seven hundred".