25999131523 has 2 divisors, whose sum is σ = 25999131524. Its totient is φ = 25999131522.

The previous prime is 25999131493. The next prime is 25999131569. The reversal of 25999131523 is 32513199952.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25999131523 is a prime.

It is not a weakly prime, because it can be changed into another prime (25999131923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12999565761 + 12999565762.

It is an arithmetic number, because the mean of its divisors is an integer number (12999565762).

Almost surely, 2^25999131523 is an apocalyptic number.

25999131523 is a deficient number, since it is larger than the sum of its proper divisors (1).

25999131523 is an equidigital number, since it uses as much as digits as its factorization.

25999131523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 656100, while the sum is 49.

The spelling of 25999131523 in words is "twenty-five billion, nine hundred ninety-nine million, one hundred thirty-one thousand, five hundred twenty-three".