25615286789 has 2 divisors, whose sum is σ = 25615286790. Its totient is φ = 25615286788.

The previous prime is 25615286699. The next prime is 25615286803. The reversal of 25615286789 is 98768251652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19128273025 + 6487013764 = 138305^2 + 80542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25615286789 is a prime.

It is a super-2 number, since 2×25615286789² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25615286189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12807643394 + 12807643395.

It is an arithmetic number, because the mean of its divisors is an integer number (12807643395).

Almost surely, 2^25615286789 is an apocalyptic number.

It is an amenable number.

25615286789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25615286789 is an equidigital number, since it uses as much as digits as its factorization.

25615286789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 59.

The spelling of 25615286789 in words is "twenty-five billion, six hundred fifteen million, two hundred eighty-six thousand, seven hundred eighty-nine".