66711856799960 has 64 divisors (see below), whose sum is σ = 151031647872000. Its totient is φ = 26519822441856.

The previous prime is 66711856799909. The next prime is 66711856799999. The reversal of 66711856799960 is 6999765811766.

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, 1134410 + ... + 11606489.

It is an arithmetic number, because the mean of its divisors is an integer number (2359869498000).

Almost surely, 2^{66711856799960} is an apocalyptic number.

It is an amenable number.

66711856799960 is an abundant number, since it is smaller than the sum of its proper divisors (84319791072040).

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

66711856799960 is a wasteful number, since it uses less digits than its factorization.

66711856799960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12741720 (or 12741716 counting only the distinct ones).

The product of its (nonzero) digits is 1851776640, while the sum is 80.

The spelling of 66711856799960 in words is "sixty-six trillion, seven hundred eleven billion, eight hundred fifty-six million, seven hundred ninety-nine thousand, nine hundred sixty".