25551815297 has 2 divisors, whose sum is σ = 25551815298. Its totient is φ = 25551815296.

The previous prime is 25551815273. The next prime is 25551815321. The reversal of 25551815297 is 79251815552.

It is a balanced prime because it is at equal distance from previous prime (25551815273) and next prime (25551815321).

It can be written as a sum of positive squares in only one way, i.e., 23861289841 + 1690525456 = 154471^2 + 41116^2 .

It is a cyclic number.

It is not a de Polignac number, because 25551815297 - 2¹⁶ = 25551749761 is a prime.

It is not a weakly prime, because it can be changed into another prime (25551815227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775907648 + 12775907649.

It is an arithmetic number, because the mean of its divisors is an integer number (12775907649).

Almost surely, 2^25551815297 is an apocalyptic number.

It is an amenable number.

25551815297 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551815297 is an equidigital number, since it uses as much as digits as its factorization.

25551815297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260000, while the sum is 50.

The spelling of 25551815297 in words is "twenty-five billion, five hundred fifty-one million, eight hundred fifteen thousand, two hundred ninety-seven".