645875231539 has 2 divisors, whose sum is σ = 645875231540. Its totient is φ = 645875231538.

The previous prime is 645875231513. The next prime is 645875231587. The reversal of 645875231539 is 935132578546.

645875231539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645875231539 - 2¹³ = 645875223347 is a prime.

It is not a weakly prime, because it can be changed into another prime (645875271539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322937615769 + 322937615770.

It is an arithmetic number, because the mean of its divisors is an integer number (322937615770).

Almost surely, 2^645875231539 is an apocalyptic number.

645875231539 is a deficient number, since it is larger than the sum of its proper divisors (1).

645875231539 is an equidigital number, since it uses as much as digits as its factorization.

645875231539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 58.

The spelling of 645875231539 in words is "six hundred forty-five billion, eight hundred seventy-five million, two hundred thirty-one thousand, five hundred thirty-nine".