66400022939 has 2 divisors, whose sum is σ = 66400022940. Its totient is φ = 66400022938.

The previous prime is 66400022929. The next prime is 66400022957. The reversal of 66400022939 is 93922000466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66400022939 - 2²⁴ = 66383245723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66400022896 and 66400022905.

It is not a weakly prime, because it can be changed into another prime (66400022929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33200011469 + 33200011470.

It is an arithmetic number, because the mean of its divisors is an integer number (33200011470).

Almost surely, 2^66400022939 is an apocalyptic number.

66400022939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66400022939 is an equidigital number, since it uses as much as digits as its factorization.

66400022939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 66400022939 in words is "sixty-six billion, four hundred million, twenty-two thousand, nine hundred thirty-nine".