66422365081 has 2 divisors, whose sum is σ = 66422365082. Its totient is φ = 66422365080.

The previous prime is 66422365067. The next prime is 66422365103. The reversal of 66422365081 is 18056322466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41754835600 + 24667529481 = 204340^2 + 157059^2 .

It is a cyclic number.

It is not a de Polignac number, because 66422365081 - 2²⁷ = 66288147353 is a prime.

It is a super-2 number, since 2×66422365081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66522365081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33211182540 + 33211182541.

It is an arithmetic number, because the mean of its divisors is an integer number (33211182541).

Almost surely, 2^66422365081 is an apocalyptic number.

It is an amenable number.

66422365081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66422365081 is an equidigital number, since it uses as much as digits as its factorization.

66422365081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 66422365081 in words is "sixty-six billion, four hundred twenty-two million, three hundred sixty-five thousand, eighty-one".