2539865693 has 2 divisors, whose sum is σ = 2539865694. Its totient is φ = 2539865692.

The previous prime is 2539865687. The next prime is 2539865729. The reversal of 2539865693 is 3965689352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1554094084 + 985771609 = 39422^2 + 31397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2539865693 - 2⁴ = 2539865677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2539865623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269932846 + 1269932847.

It is an arithmetic number, because the mean of its divisors is an integer number (1269932847).

Almost surely, 2^2539865693 is an apocalyptic number.

It is an amenable number.

2539865693 is a deficient number, since it is larger than the sum of its proper divisors (1).

2539865693 is an equidigital number, since it uses as much as digits as its factorization.

2539865693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10497600, while the sum is 56.

The square root of 2539865693 is about 50397.0802031229. The cubic root of 2539865693 is about 1364.3849408245.

The spelling of 2539865693 in words is "two billion, five hundred thirty-nine million, eight hundred sixty-five thousand, six hundred ninety-three".