660897911812608 has 960 divisors, whose sum is σ = 2092363987633920. Its totient is φ = 207951490252800.

The previous prime is 660897911812591. The next prime is 660897911812651. The reversal of 660897911812608 is 806218119798066.

660897911812608 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 9 + 7 + 9 + 1 + 1 + 8 + 1 + 2 + 608 = 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 95 ways as a sum of consecutive naturals, for example, 36755338978 + ... + 36755356958.

It is an arithmetic number, because the mean of its divisors is an integer number (2179545820452).

Almost surely, 2^{660897911812608} 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 660897911812608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046181993816960).

660897911812608 is an abundant number, since it is smaller than the sum of its proper divisors (1431466075821312).

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

660897911812608 is a wasteful number, since it uses less digits than its factorization.

660897911812608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18271 (or 18243 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 72.

The spelling of 660897911812608 in words is "six hundred sixty trillion, eight hundred ninety-seven billion, nine hundred eleven million, eight hundred twelve thousand, six hundred eight".