64493239939 has 2 divisors, whose sum is σ = 64493239940. Its totient is φ = 64493239938.

The previous prime is 64493239919. The next prime is 64493239961. The reversal of 64493239939 is 93993239446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64493239939 - 2²³ = 64484851331 is a prime.

It is not a weakly prime, because it can be changed into another prime (64493239919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32246619969 + 32246619970.

It is an arithmetic number, because the mean of its divisors is an integer number (32246619970).

Almost surely, 2^64493239939 is an apocalyptic number.

64493239939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64493239939 is an equidigital number, since it uses as much as digits as its factorization.

64493239939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 61.

The spelling of 64493239939 in words is "sixty-four billion, four hundred ninety-three million, two hundred thirty-nine thousand, nine hundred thirty-nine".