665075602656 has 192 divisors, whose sum is σ = 1996090387200. Its totient is φ = 215282354688.

The previous prime is 665075602613. The next prime is 665075602687. The reversal of 665075602656 is 656206570566.

665075602656 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 7 + 560 + 26 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 16699375 + ... + 16739153.

It is an arithmetic number, because the mean of its divisors is an integer number (10396304100).

Almost surely, 2^665075602656 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 665075602656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998045193600).

665075602656 is an abundant number, since it is smaller than the sum of its proper divisors (1331014784544).

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

665075602656 is a wasteful number, since it uses less digits than its factorization.

665075602656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40358 (or 40344 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 54.

The spelling of 665075602656 in words is "six hundred sixty-five billion, seventy-five million, six hundred two thousand, six hundred fifty-six".