25040143549 has 2 divisors, whose sum is σ = 25040143550. Its totient is φ = 25040143548.

The previous prime is 25040143547. The next prime is 25040143589. The reversal of 25040143549 is 94534104052.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22347260100 + 2692883449 = 149490^2 + 51893^2 .

It is a cyclic number.

It is not a de Polignac number, because 25040143549 - 2¹ = 25040143547 is a prime.

Together with 25040143547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25040143543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12520071774 + 12520071775.

It is an arithmetic number, because the mean of its divisors is an integer number (12520071775).

Almost surely, 2^25040143549 is an apocalyptic number.

It is an amenable number.

25040143549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25040143549 is an equidigital number, since it uses as much as digits as its factorization.

25040143549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 25040143549 in words is "twenty-five billion, forty million, one hundred forty-three thousand, five hundred forty-nine".