65644145639 has 2 divisors, whose sum is σ = 65644145640. Its totient is φ = 65644145638.

The previous prime is 65644145599. The next prime is 65644145657. The reversal of 65644145639 is 93654144656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65644145639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65644145669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32822072819 + 32822072820.

It is an arithmetic number, because the mean of its divisors is an integer number (32822072820).

Almost surely, 2^65644145639 is an apocalyptic number.

65644145639 is a deficient number, since it is larger than the sum of its proper divisors (1).

65644145639 is an equidigital number, since it uses as much as digits as its factorization.

65644145639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9331200, while the sum is 53.

The spelling of 65644145639 in words is "sixty-five billion, six hundred forty-four million, one hundred forty-five thousand, six hundred thirty-nine".