66739583961720 has 192 divisors, whose sum is σ = 221750441246880. Its totient is φ = 17401828973568.

The previous prime is 66739583961709. The next prime is 66739583961733. The reversal of 66739583961720 is 2716938593766.

66739583961720 is a `hidden beast` number, since 6 + 6 + 7 + 3 + 9 + 583 + 9 + 6 + 17 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 378642 + ... + 11559521.

Almost surely, 2^{66739583961720} is an apocalyptic number.

66739583961720 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 66739583961720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110875220623440).

66739583961720 is an abundant number, since it is smaller than the sum of its proper divisors (155010857285160).

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

66739583961720 is a wasteful number, since it uses less digits than its factorization.

66739583961720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11938526 (or 11938519 counting only the distinct ones).

The product of its (nonzero) digits is 617258880, while the sum is 72.

The spelling of 66739583961720 in words is "sixty-six trillion, seven hundred thirty-nine billion, five hundred eighty-three million, nine hundred sixty-one thousand, seven hundred twenty".