66405626012939 has 2 divisors, whose sum is σ = 66405626012940. Its totient is φ = 66405626012938.

The previous prime is 66405626012933. The next prime is 66405626013029. The reversal of 66405626012939 is 93921062650466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66405626012939 - 2²⁴ = 66405609235723 is a prime.

It is not a weakly prime, because it can be changed into another prime (66405626012933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33202813006469 + 33202813006470.

It is an arithmetic number, because the mean of its divisors is an integer number (33202813006470).

Almost surely, 2^{66405626012939} is an apocalyptic number.

66405626012939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66405626012939 is an equidigital number, since it uses as much as digits as its factorization.

66405626012939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25194240, while the sum is 59.

The spelling of 66405626012939 in words is "sixty-six trillion, four hundred five billion, six hundred twenty-six million, twelve thousand, nine hundred thirty-nine".