25700000243 has 2 divisors, whose sum is σ = 25700000244. Its totient is φ = 25700000242.

The previous prime is 25700000213. The next prime is 25700000279. The reversal of 25700000243 is 34200000752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25700000243 - 2⁸ = 25699999987 is a prime.

It is not a weakly prime, because it can be changed into another prime (25700000203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850000121 + 12850000122.

It is an arithmetic number, because the mean of its divisors is an integer number (12850000122).

Almost surely, 2^25700000243 is an apocalyptic number.

25700000243 is a deficient number, since it is larger than the sum of its proper divisors (1).

25700000243 is an equidigital number, since it uses as much as digits as its factorization.

25700000243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 23.

Adding to 25700000243 its reverse (34200000752), we get a palindrome (59900000995).

The spelling of 25700000243 in words is "twenty-five billion, seven hundred million, two hundred forty-three", and thus it is an aban number.