66317702560820 has 12 divisors (see below), whose sum is σ = 139267175377764. Its totient is φ = 26527081024320.

The previous prime is 66317702560741. The next prime is 66317702560831. The reversal of 66317702560820 is 2806520771366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31506262945936 + 34811439614884 = 5613044^2 + 5900122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657942564001 + ... + 1657942564040.

It is an arithmetic number, because the mean of its divisors is an integer number (11605597948147).

Almost surely, 2^{66317702560820} is an apocalyptic number.

It is an amenable number.

66317702560820 is an abundant number, since it is smaller than the sum of its proper divisors (72949472816944).

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

66317702560820 is a wasteful number, since it uses less digits than its factorization.

66317702560820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315885128050 (or 3315885128048 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 66317702560820 in words is "sixty-six trillion, three hundred seventeen billion, seven hundred two million, five hundred sixty thousand, eight hundred twenty".