64444442539 has 2 divisors, whose sum is σ = 64444442540. Its totient is φ = 64444442538.

The previous prime is 64444442521. The next prime is 64444442549. The reversal of 64444442539 is 93524444446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64444442539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64444442492 and 64444442501.

It is not a weakly prime, because it can be changed into another prime (64444442519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222221269 + 32222221270.

It is an arithmetic number, because the mean of its divisors is an integer number (32222221270).

Almost surely, 2^64444442539 is an apocalyptic number.

64444442539 is a deficient number, since it is larger than the sum of its proper divisors (1).

64444442539 is an equidigital number, since it uses as much as digits as its factorization.

64444442539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 49.

The spelling of 64444442539 in words is "sixty-four billion, four hundred forty-four million, four hundred forty-two thousand, five hundred thirty-nine".