665241587896704 has 1024 divisors, whose sum is σ = 2254226817024000. Its totient is φ = 169091376906240.

The previous prime is 665241587896703. The next prime is 665241587896771. The reversal of 665241587896704 is 407698785142566.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a self number, because there is not a number n which added to its sum of digits gives 665241587896704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665241587896703) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 341324569522 + ... + 341324571470.

It is an arithmetic number, because the mean of its divisors is an integer number (2201393376000).

Almost surely, 2^{665241587896704} is an apocalyptic number.

665241587896704 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 665241587896704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1127113408512000).

665241587896704 is an abundant number, since it is smaller than the sum of its proper divisors (1588985229127296).

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

665241587896704 is a wasteful number, since it uses less digits than its factorization.

665241587896704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 4877107200, while the sum is 78.

The spelling of 665241587896704 in words is "six hundred sixty-five trillion, two hundred forty-one billion, five hundred eighty-seven million, eight hundred ninety-six thousand, seven hundred four".