25491883821 has 8 divisors (see below), whose sum is σ = 34907805024. Its totient is φ = 16535275920.

The previous prime is 25491883799. The next prime is 25491883831. The reversal of 25491883821 is 12838819452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25491883821 - 2⁶ = 25491883757 is a prime.

It is a super-2 number, since 2×25491883821² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491883831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114828195 + ... + 114828416.

It is an arithmetic number, because the mean of its divisors is an integer number (4363475628).

Almost surely, 2^25491883821 is an apocalyptic number.

It is an amenable number.

25491883821 is a deficient number, since it is larger than the sum of its proper divisors (9415921203).

25491883821 is a wasteful number, since it uses less digits than its factorization.

25491883821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229656651.

The product of its digits is 1105920, while the sum is 51.

The spelling of 25491883821 in words is "twenty-five billion, four hundred ninety-one million, eight hundred eighty-three thousand, eight hundred twenty-one".