645415594039 has 2 divisors, whose sum is σ = 645415594040. Its totient is φ = 645415594038.

The previous prime is 645415594027. The next prime is 645415594073. The reversal of 645415594039 is 930495514546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645415594039 - 2²⁵ = 645382039607 is a prime.

It is a super-2 number, since 2×645415594039² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645415594079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707797019 + 322707797020.

It is an arithmetic number, because the mean of its divisors is an integer number (322707797020).

Almost surely, 2^645415594039 is an apocalyptic number.

645415594039 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415594039 is an equidigital number, since it uses as much as digits as its factorization.

645415594039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664000, while the sum is 55.

The spelling of 645415594039 in words is "six hundred forty-five billion, four hundred fifteen million, five hundred ninety-four thousand, thirty-nine".