25261551437 has 2 divisors, whose sum is σ = 25261551438. Its totient is φ = 25261551436.

The previous prime is 25261551379. The next prime is 25261551509. The reversal of 25261551437 is 73415516252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21828880516 + 3432670921 = 147746^2 + 58589^2 .

It is a cyclic number.

It is not a de Polignac number, because 25261551437 - 2¹⁸ = 25261289293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25261551394 and 25261551403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25261571437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12630775718 + 12630775719.

It is an arithmetic number, because the mean of its divisors is an integer number (12630775719).

Almost surely, 2^25261551437 is an apocalyptic number.

It is an amenable number.

25261551437 is a deficient number, since it is larger than the sum of its proper divisors (1).

25261551437 is an equidigital number, since it uses as much as digits as its factorization.

25261551437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 41.

The spelling of 25261551437 in words is "twenty-five billion, two hundred sixty-one million, five hundred fifty-one thousand, four hundred thirty-seven".