25128902891 has 2 divisors, whose sum is σ = 25128902892. Its totient is φ = 25128902890.

The previous prime is 25128902873. The next prime is 25128902933. The reversal of 25128902891 is 19820982152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25128902891 - 2¹⁴ = 25128886507 is a prime.

It is not a weakly prime, because it can be changed into another prime (25128902831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564451445 + 12564451446.

It is an arithmetic number, because the mean of its divisors is an integer number (12564451446).

Almost surely, 2^25128902891 is an apocalyptic number.

25128902891 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128902891 is an equidigital number, since it uses as much as digits as its factorization.

25128902891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 25128902891 in words is "twenty-five billion, one hundred twenty-eight million, nine hundred two thousand, eight hundred ninety-one".