25643420829 has 32 divisors (see below), whose sum is σ = 41183609600. Its totient is φ = 15676027200.

The previous prime is 25643420821. The next prime is 25643420861. The reversal of 25643420829 is 92802434652.

25643420829 is a `hidden beast` number, since 2 + 5 + 6 + 434 + 208 + 2 + 9 = 666.

It is not a de Polignac number, because 25643420829 - 2³ = 25643420821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643420821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188914 + ... + 294915.

It is an arithmetic number, because the mean of its divisors is an integer number (1286987800).

Almost surely, 2^25643420829 is an apocalyptic number.

It is an amenable number.

25643420829 is a deficient number, since it is larger than the sum of its proper divisors (15540188771).

25643420829 is a wasteful number, since it uses less digits than its factorization.

25643420829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484002 (or 483996 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 25643420829 in words is "twenty-five billion, six hundred forty-three million, four hundred twenty thousand, eight hundred twenty-nine".