66357110681 has 2 divisors, whose sum is σ = 66357110682. Its totient is φ = 66357110680.

The previous prime is 66357110653. The next prime is 66357110689. The reversal of 66357110681 is 18601175366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50060035081 + 16297075600 = 223741^2 + 127660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66357110681 is a prime.

It is a super-2 number, since 2×66357110681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66357110689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178555340 + 33178555341.

It is an arithmetic number, because the mean of its divisors is an integer number (33178555341).

Almost surely, 2^66357110681 is an apocalyptic number.

It is an amenable number.

66357110681 is a deficient number, since it is larger than the sum of its proper divisors (1).

66357110681 is an equidigital number, since it uses as much as digits as its factorization.

66357110681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 66357110681 in words is "sixty-six billion, three hundred fifty-seven million, one hundred ten thousand, six hundred eighty-one".