66380772720240 has 480 divisors, whose sum is σ = 253114837327872. Its totient is φ = 15573194841600.

The previous prime is 66380772720203. The next prime is 66380772720281. The reversal of 66380772720240 is 4202727708366.

It is a happy number.

66380772720240 is a `hidden beast` number, since 6 + 63 + 8 + 0 + 77 + 272 + 0 + 240 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 28590697 + ... + 30825143.

Almost surely, 2^{66380772720240} is an apocalyptic number.

66380772720240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66380772720240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126557418663936).

66380772720240 is an abundant number, since it is smaller than the sum of its proper divisors (186734064607632).

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

66380772720240 is a wasteful number, since it uses less digits than its factorization.

66380772720240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234530 (or 2234499 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 54.

The spelling of 66380772720240 in words is "sixty-six trillion, three hundred eighty billion, seven hundred seventy-two million, seven hundred twenty thousand, two hundred forty".