25642139429 has 2 divisors, whose sum is σ = 25642139430. Its totient is φ = 25642139428.

The previous prime is 25642139417. The next prime is 25642139461. The reversal of 25642139429 is 92493124652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21786350404 + 3855789025 = 147602^2 + 62095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25642139429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25642139129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821069714 + 12821069715.

It is an arithmetic number, because the mean of its divisors is an integer number (12821069715).

Almost surely, 2^25642139429 is an apocalyptic number.

It is an amenable number.

25642139429 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642139429 is an equidigital number, since it uses as much as digits as its factorization.

25642139429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The spelling of 25642139429 in words is "twenty-five billion, six hundred forty-two million, one hundred thirty-nine thousand, four hundred twenty-nine".