25311943687 has 2 divisors, whose sum is σ = 25311943688. Its totient is φ = 25311943686.

The previous prime is 25311943667. The next prime is 25311943711. The reversal of 25311943687 is 78634911352.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25311943687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25311943687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25311943627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12655971843 + 12655971844.

It is an arithmetic number, because the mean of its divisors is an integer number (12655971844).

Almost surely, 2^25311943687 is an apocalyptic number.

25311943687 is a deficient number, since it is larger than the sum of its proper divisors (1).

25311943687 is an equidigital number, since it uses as much as digits as its factorization.

25311943687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The spelling of 25311943687 in words is "twenty-five billion, three hundred eleven million, nine hundred forty-three thousand, six hundred eighty-seven".