665262472976640 has 1728 divisors, whose sum is σ = 3034527039258624. Its totient is φ = 130514042880000.

The previous prime is 665262472976639. The next prime is 665262472976809. The reversal of 665262472976640 is 46679274262566.

665262472976640 is a `hidden beast` number, since 6 + 6 + 5 + 2 + 6 + 2 + 472 + 97 + 6 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1127132805 + ... + 1127722875.

It is an arithmetic number, because the mean of its divisors is an integer number (1756092036608).

Almost surely, 2^{665262472976640} is an apocalyptic number.

665262472976640 is a gapful number since it is divisible by the number (60) 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 665262472976640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517263519629312).

665262472976640 is an abundant number, since it is smaller than the sum of its proper divisors (2369264566281984).

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

665262472976640 is a wasteful number, since it uses less digits than its factorization.

665262472976640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590188 (or 590171 counting only the distinct ones).

The product of its (nonzero) digits is 2194698240, while the sum is 72.

The spelling of 665262472976640 in words is "six hundred sixty-five trillion, two hundred sixty-two billion, four hundred seventy-two million, nine hundred seventy-six thousand, six hundred forty".