25333639481 has 2 divisors, whose sum is σ = 25333639482. Its totient is φ = 25333639480.

The previous prime is 25333639469. The next prime is 25333639489. The reversal of 25333639481 is 18493633352.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14675141881 + 10658497600 = 121141^2 + 103240^2 .

It is a cyclic number.

It is not a de Polignac number, because 25333639481 - 2²² = 25329445177 is a prime.

It is a super-2 number, since 2×25333639481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25333639489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12666819740 + 12666819741.

It is an arithmetic number, because the mean of its divisors is an integer number (12666819741).

Almost surely, 2^25333639481 is an apocalyptic number.

It is an amenable number.

25333639481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25333639481 is an equidigital number, since it uses as much as digits as its factorization.

25333639481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 47.

The spelling of 25333639481 in words is "twenty-five billion, three hundred thirty-three million, six hundred thirty-nine thousand, four hundred eighty-one".