25623145109 has 2 divisors, whose sum is σ = 25623145110. Its totient is φ = 25623145108.

The previous prime is 25623145103. The next prime is 25623145151. The reversal of 25623145109 is 90154132652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23691982084 + 1931163025 = 153922^2 + 43945^2 .

It is a cyclic number.

It is not a de Polignac number, because 25623145109 - 2⁸ = 25623144853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25623145103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12811572554 + 12811572555.

It is an arithmetic number, because the mean of its divisors is an integer number (12811572555).

Almost surely, 2^25623145109 is an apocalyptic number.

It is an amenable number.

25623145109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25623145109 is an equidigital number, since it uses as much as digits as its factorization.

25623145109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 25623145109 in words is "twenty-five billion, six hundred twenty-three million, one hundred forty-five thousand, one hundred nine".