25775136533 has 2 divisors, whose sum is σ = 25775136534. Its totient is φ = 25775136532.

The previous prime is 25775136521. The next prime is 25775136559. The reversal of 25775136533 is 33563157752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25092777649 + 682358884 = 158407^2 + 26122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25775136533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25775136593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12887568266 + 12887568267.

It is an arithmetic number, because the mean of its divisors is an integer number (12887568267).

Almost surely, 2^25775136533 is an apocalyptic number.

It is an amenable number.

25775136533 is a deficient number, since it is larger than the sum of its proper divisors (1).

25775136533 is an equidigital number, since it uses as much as digits as its factorization.

25775136533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1984500, while the sum is 47.

The spelling of 25775136533 in words is "twenty-five billion, seven hundred seventy-five million, one hundred thirty-six thousand, five hundred thirty-three".