665147904 has 160 divisors (see below), whose sum is σ = 1867261440. Its totient is φ = 210124800.

The previous prime is 665147893. The next prime is 665147911. The reversal of 665147904 is 409741566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2904462 + ... + 2904690.

It is an arithmetic number, because the mean of its divisors is an integer number (11670384).

Almost surely, 2^665147904 is an apocalyptic number.

665147904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665147904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933630720).

665147904 is an abundant number, since it is smaller than the sum of its proper divisors (1202113536).

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

665147904 is a wasteful number, since it uses less digits than its factorization.

665147904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 665147904 is about 25790.4614925751. The cubic root of 665147904 is about 872.9165796407.

The spelling of 665147904 in words is "six hundred sixty-five million, one hundred forty-seven thousand, nine hundred four".