864365721539 has 2 divisors, whose sum is σ = 864365721540. Its totient is φ = 864365721538.

The previous prime is 864365721493. The next prime is 864365721559. The reversal of 864365721539 is 935127563468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864365721539 is a prime.

It is not a weakly prime, because it can be changed into another prime (864365721559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432182860769 + 432182860770.

It is an arithmetic number, because the mean of its divisors is an integer number (432182860770).

Almost surely, 2^864365721539 is an apocalyptic number.

864365721539 is a deficient number, since it is larger than the sum of its proper divisors (1).

864365721539 is an equidigital number, since it uses as much as digits as its factorization.

864365721539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 59.

The spelling of 864365721539 in words is "eight hundred sixty-four billion, three hundred sixty-five million, seven hundred twenty-one thousand, five hundred thirty-nine".