25128892549 has 2 divisors, whose sum is σ = 25128892550. Its totient is φ = 25128892548.

The previous prime is 25128892531. The next prime is 25128892553. The reversal of 25128892549 is 94529882152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24406250625 + 722641924 = 156225^2 + 26882^2 .

It is a cyclic number.

It is not a de Polignac number, because 25128892549 - 2²⁵ = 25095338117 is a prime.

It is a super-2 number, since 2×25128892549² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25128892549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25128892519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564446274 + 12564446275.

It is an arithmetic number, because the mean of its divisors is an integer number (12564446275).

Almost surely, 2^25128892549 is an apocalyptic number.

It is an amenable number.

25128892549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128892549 is an equidigital number, since it uses as much as digits as its factorization.

25128892549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 55.

The spelling of 25128892549 in words is "twenty-five billion, one hundred twenty-eight million, eight hundred ninety-two thousand, five hundred forty-nine".