25761999013 has 2 divisors, whose sum is σ = 25761999014. Its totient is φ = 25761999012.

The previous prime is 25761999001. The next prime is 25761999031. The reversal of 25761999013 is 31099916752.

It is a happy number.

Together with next prime (25761999031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25599360004 + 162639009 = 159998^2 + 12753^2 .

It is a cyclic number.

It is not a de Polignac number, because 25761999013 - 2⁵ = 25761998981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25761999313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12880999506 + 12880999507.

It is an arithmetic number, because the mean of its divisors is an integer number (12880999507).

Almost surely, 2^25761999013 is an apocalyptic number.

It is an amenable number.

25761999013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25761999013 is an equidigital number, since it uses as much as digits as its factorization.

25761999013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 52.

The spelling of 25761999013 in words is "twenty-five billion, seven hundred sixty-one million, nine hundred ninety-nine thousand, thirteen".