25278304109 has 2 divisors, whose sum is σ = 25278304110. Its totient is φ = 25278304108.

The previous prime is 25278304099. The next prime is 25278304201. The reversal of 25278304109 is 90140387252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23884775209 + 1393528900 = 154547^2 + 37330^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278304109 - 2³² = 20983336813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25278304609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639152054 + 12639152055.

It is an arithmetic number, because the mean of its divisors is an integer number (12639152055).

Almost surely, 2^25278304109 is an apocalyptic number.

It is an amenable number.

25278304109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25278304109 is an equidigital number, since it uses as much as digits as its factorization.

25278304109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 25278304109 in words is "twenty-five billion, two hundred seventy-eight million, three hundred four thousand, one hundred nine".