66868270961 has 2 divisors, whose sum is σ = 66868270962. Its totient is φ = 66868270960.

The previous prime is 66868270919. The next prime is 66868270991. The reversal of 66868270961 is 16907286866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65769679936 + 1098591025 = 256456^2 + 33145^2 .

It is a cyclic number.

It is not a de Polignac number, because 66868270961 - 2²⁶ = 66801162097 is a prime.

It is a super-2 number, since 2×66868270961² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66868270961.

It is not a weakly prime, because it can be changed into another prime (66868270991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434135480 + 33434135481.

It is an arithmetic number, because the mean of its divisors is an integer number (33434135481).

Almost surely, 2^66868270961 is an apocalyptic number.

It is an amenable number.

66868270961 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868270961 is an equidigital number, since it uses as much as digits as its factorization.

66868270961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 66868270961 in words is "sixty-six billion, eight hundred sixty-eight million, two hundred seventy thousand, nine hundred sixty-one".