25542421951 has 2 divisors, whose sum is σ = 25542421952. Its totient is φ = 25542421950.

The previous prime is 25542421913. The next prime is 25542422011. The reversal of 25542421951 is 15912424552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25542421951 - 2⁹ = 25542421439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25542421451) 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 as a sum of consecutive naturals, namely, 12771210975 + 12771210976.

It is an arithmetic number, because the mean of its divisors is an integer number (12771210976).

Almost surely, 2^25542421951 is an apocalyptic number.

25542421951 is a deficient number, since it is larger than the sum of its proper divisors (1).

25542421951 is an equidigital number, since it uses as much as digits as its factorization.

25542421951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 40.

The spelling of 25542421951 in words is "twenty-five billion, five hundred forty-two million, four hundred twenty-one thousand, nine hundred fifty-one".