66746939786240 has 176 divisors, whose sum is σ = 183497678380800. Its totient is φ = 22820915085312.

The previous prime is 66746939786221. The next prime is 66746939786257. The reversal of 66746939786240 is 4268793964766.

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, 10272746 + ... + 15460374.

Almost surely, 2^{66746939786240} 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 66746939786240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91748839190400).

66746939786240 is an abundant number, since it is smaller than the sum of its proper divisors (116750738594560).

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

66746939786240 is a wasteful number, since it uses less digits than its factorization.

66746939786240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188020 (or 5188002 counting only the distinct ones).

The product of its (nonzero) digits is 3950456832, while the sum is 77.

The spelling of 66746939786240 in words is "sixty-six trillion, seven hundred forty-six billion, nine hundred thirty-nine million, seven hundred eighty-six thousand, two hundred forty".