25633630421 has 16 divisors (see below), whose sum is σ = 31325978880. Its totient is φ = 20474476800.

The previous prime is 25633630411. The next prime is 25633630423. The reversal of 25633630421 is 12403633652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25633630421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25633630423) 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, 1054361 + ... + 1078398.

It is an arithmetic number, because the mean of its divisors is an integer number (1957873680).

Almost surely, 2^25633630421 is an apocalyptic number.

It is an amenable number.

25633630421 is a deficient number, since it is larger than the sum of its proper divisors (5692348459).

25633630421 is a wasteful number, since it uses less digits than its factorization.

25633630421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132884.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 25633630421 in words is "twenty-five billion, six hundred thirty-three million, six hundred thirty thousand, four hundred twenty-one".