25266405287 has 2 divisors, whose sum is σ = 25266405288. Its totient is φ = 25266405286.

The previous prime is 25266405259. The next prime is 25266405299. The reversal of 25266405287 is 78250466252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25266405287 - 2¹⁰ = 25266404263 is a prime.

It is a super-2 number, since 2×25266405287² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25266405187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12633202643 + 12633202644.

It is an arithmetic number, because the mean of its divisors is an integer number (12633202644).

Almost surely, 2^25266405287 is an apocalyptic number.

25266405287 is a deficient number, since it is larger than the sum of its proper divisors (1).

25266405287 is an equidigital number, since it uses as much as digits as its factorization.

25266405287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 25266405287 in words is "twenty-five billion, two hundred sixty-six million, four hundred five thousand, two hundred eighty-seven".