66681340075 has 36 divisors (see below), whose sum is σ = 96214492920. Its totient is φ = 45710058240.

The previous prime is 66681340021. The next prime is 66681340079. The reversal of 66681340075 is 57004318666.

It is not a de Polignac number, because 66681340075 - 2¹¹ = 66681338027 is a prime.

It is a super-2 number, since 2×66681340075² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66681340079) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5228056 + ... + 5240794.

Almost surely, 2^66681340075 is an apocalyptic number.

66681340075 is a deficient number, since it is larger than the sum of its proper divisors (29533152845).

66681340075 is a wasteful number, since it uses less digits than its factorization.

66681340075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17036 (or 17024 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 66681340075 in words is "sixty-six billion, six hundred eighty-one million, three hundred forty thousand, seventy-five".