25891154687 has 2 divisors, whose sum is σ = 25891154688. Its totient is φ = 25891154686.

The previous prime is 25891154677. The next prime is 25891154693. The reversal of 25891154687 is 78645119852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25891154687 - 2⁸ = 25891154431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25891154677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945577343 + 12945577344.

It is an arithmetic number, because the mean of its divisors is an integer number (12945577344).

Almost surely, 2^25891154687 is an apocalyptic number.

25891154687 is a deficient number, since it is larger than the sum of its proper divisors (1).

25891154687 is an equidigital number, since it uses as much as digits as its factorization.

25891154687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 56.

The spelling of 25891154687 in words is "twenty-five billion, eight hundred ninety-one million, one hundred fifty-four thousand, six hundred eighty-seven".