25042106561491 has 2 divisors, whose sum is σ = 25042106561492. Its totient is φ = 25042106561490.

The previous prime is 25042106561401. The next prime is 25042106561503. The reversal of 25042106561491 is 19416560124052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25042106561491 - 2⁷ = 25042106561363 is a prime.

It is not a weakly prime, because it can be changed into another prime (25042106561401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12521053280745 + 12521053280746.

It is an arithmetic number, because the mean of its divisors is an integer number (12521053280746).

Almost surely, 2^{25042106561491} is an apocalyptic number.

25042106561491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25042106561491 is an equidigital number, since it uses as much as digits as its factorization.

25042106561491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 25042106561491 in words is "twenty-five trillion, forty-two billion, one hundred six million, five hundred sixty-one thousand, four hundred ninety-one".