25428043631 has 2 divisors, whose sum is σ = 25428043632. Its totient is φ = 25428043630.

The previous prime is 25428043609. The next prime is 25428043633. The reversal of 25428043631 is 13634082452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25428043631 is a prime.

It is a super-2 number, since 2×25428043631² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 25428043633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25428043633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12714021815 + 12714021816.

It is an arithmetic number, because the mean of its divisors is an integer number (12714021816).

Almost surely, 2^25428043631 is an apocalyptic number.

25428043631 is a deficient number, since it is larger than the sum of its proper divisors (1).

25428043631 is an equidigital number, since it uses as much as digits as its factorization.

25428043631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 25428043631 in words is "twenty-five billion, four hundred twenty-eight million, forty-three thousand, six hundred thirty-one".