665455344 has 160 divisors (see below), whose sum is σ = 1918002240. Its totient is φ = 197836800.

The previous prime is 665455321. The next prime is 665455409. The reversal of 665455344 is 443554566.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665455296 and 665455305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1443274 + ... + 1443734.

It is an arithmetic number, because the mean of its divisors is an integer number (11987514).

Almost surely, 2^665455344 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 665455344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959001120).

665455344 is an abundant number, since it is smaller than the sum of its proper divisors (1252546896).

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

665455344 is a wasteful number, since it uses less digits than its factorization.

665455344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its digits is 864000, while the sum is 42.

The square root of 665455344 is about 25796.4211471281. The cubic root of 665455344 is about 873.0510500517.

The spelling of 665455344 in words is "six hundred sixty-five million, four hundred fifty-five thousand, three hundred forty-four".