25990354421 has 4 divisors (see below), whose sum is σ = 26594781312. Its totient is φ = 25385927532.

The previous prime is 25990354417. The next prime is 25990354447. The reversal of 25990354421 is 12445309952.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25990354421 - 2² = 25990354417 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 (25990354921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302213381 + ... + 302213466.

It is an arithmetic number, because the mean of its divisors is an integer number (6648695328).

Almost surely, 2^25990354421 is an apocalyptic number.

It is an amenable number.

25990354421 is a deficient number, since it is larger than the sum of its proper divisors (604426891).

25990354421 is an equidigital number, since it uses as much as digits as its factorization.

25990354421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604426890.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 25990354421 in words is "twenty-five billion, nine hundred ninety million, three hundred fifty-four thousand, four hundred twenty-one".