66393856825088 has 72 divisors (see below), whose sum is σ = 142896275779488. Its totient is φ = 30606083592192.

The previous prime is 66393856825081. The next prime is 66393856825091. The reversal of 66393856825088 is 88052865839366.

It is a super-2 number, since 2×66393856825088² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66393856825081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9381395 + ... + 14859282.

Almost surely, 2^{66393856825088} is an apocalyptic number.

It is an amenable number.

66393856825088 is an abundant number, since it is smaller than the sum of its proper divisors (76502418954400).

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

66393856825088 is a wasteful number, since it uses less digits than its factorization.

66393856825088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24241529 (or 24241515 counting only the distinct ones).

The product of its (nonzero) digits is 3583180800, while the sum is 77.

The spelling of 66393856825088 in words is "sixty-six trillion, three hundred ninety-three billion, eight hundred fifty-six million, eight hundred twenty-five thousand, eighty-eight".