66746565644020 has 48 divisors (see below), whose sum is σ = 142556033592000. Its totient is φ = 26243801803520.

The previous prime is 66746565644009. The next prime is 66746565644047. The reversal of 66746565644020 is 2044656564766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66746565644020.

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, 10986456 + ... + 15943504.

It is an arithmetic number, because the mean of its divisors is an integer number (2969917366500).

Almost surely, 2^{66746565644020} is an apocalyptic number.

It is an amenable number.

66746565644020 is an abundant number, since it is smaller than the sum of its proper divisors (75809467947980).

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

66746565644020 is a wasteful number, since it uses less digits than its factorization.

66746565644020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4968528 (or 4968526 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 61.

The spelling of 66746565644020 in words is "sixty-six trillion, seven hundred forty-six billion, five hundred sixty-five million, six hundred forty-four thousand, twenty".