66386557304660 has 24 divisors (see below), whose sum is σ = 139412307511176. Its totient is φ = 26554520603520.

The previous prime is 66386557304657. The next prime is 66386557304677. The reversal of 66386557304660 is 6640375568366.

It can be written as a sum of positive squares in 4 ways, for example, as 3953360749636 + 62433196555024 = 1988306^2 + 7901468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961967 + ... + 11562806.

It is an arithmetic number, because the mean of its divisors is an integer number (5808846146299).

Almost surely, 2^{66386557304660} is an apocalyptic number.

It is an amenable number.

66386557304660 is an abundant number, since it is smaller than the sum of its proper divisors (73025750206516).

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

66386557304660 is a wasteful number, since it uses less digits than its factorization.

66386557304660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12789803 (or 12789801 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 65.

The spelling of 66386557304660 in words is "sixty-six trillion, three hundred eighty-six billion, five hundred fifty-seven million, three hundred four thousand, six hundred sixty".