25421064813 has 16 divisors (see below), whose sum is σ = 37663401600. Its totient is φ = 16946222400.

The previous prime is 25421064797. The next prime is 25421064833. The reversal of 25421064813 is 31846012452.

It is a happy number.

25421064813 is a `hidden beast` number, since 2 + 5 + 4 + 2 + 1 + 0 + 648 + 1 + 3 = 666.

It is not a de Polignac number, because 25421064813 - 2⁴ = 25421064797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421064833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594088 + ... + 635438.

It is an arithmetic number, because the mean of its divisors is an integer number (2353962600).

Almost surely, 2^25421064813 is an apocalyptic number.

It is an amenable number.

25421064813 is a deficient number, since it is larger than the sum of its proper divisors (12242336787).

25421064813 is a wasteful number, since it uses less digits than its factorization.

25421064813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64129 (or 64123 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 25421064813 in words is "twenty-five billion, four hundred twenty-one million, sixty-four thousand, eight hundred thirteen".