25801480949 has 2 divisors, whose sum is σ = 25801480950. Its totient is φ = 25801480948.

The previous prime is 25801480921. The next prime is 25801480973. The reversal of 25801480949 is 94908410852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17421360100 + 8380120849 = 131990^2 + 91543^2 .

It is a cyclic number.

It is not a de Polignac number, because 25801480949 - 2²⁰ = 25800432373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25801480897 and 25801480906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25801480919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12900740474 + 12900740475.

It is an arithmetic number, because the mean of its divisors is an integer number (12900740475).

Almost surely, 2^25801480949 is an apocalyptic number.

It is an amenable number.

25801480949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25801480949 is an equidigital number, since it uses as much as digits as its factorization.

25801480949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 25801480949 in words is "twenty-five billion, eight hundred one million, four hundred eighty thousand, nine hundred forty-nine".