25748505691 has 2 divisors, whose sum is σ = 25748505692. Its totient is φ = 25748505690.

The previous prime is 25748505647. The next prime is 25748505701. The reversal of 25748505691 is 19650584752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25748505691 - 2¹⁹ = 25747981403 is a prime.

It is not a weakly prime, because it can be changed into another prime (25748505631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12874252845 + 12874252846.

It is an arithmetic number, because the mean of its divisors is an integer number (12874252846).

Almost surely, 2^25748505691 is an apocalyptic number.

25748505691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25748505691 is an equidigital number, since it uses as much as digits as its factorization.

25748505691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 52.

The spelling of 25748505691 in words is "twenty-five billion, seven hundred forty-eight million, five hundred five thousand, six hundred ninety-one".