25761499571 has 2 divisors, whose sum is σ = 25761499572. Its totient is φ = 25761499570.

The previous prime is 25761499553. The next prime is 25761499573. The reversal of 25761499571 is 17599416752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25761499571 - 2¹⁰ = 25761498547 is a prime.

Together with 25761499573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25761499573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12880749785 + 12880749786.

It is an arithmetic number, because the mean of its divisors is an integer number (12880749786).

Almost surely, 2^25761499571 is an apocalyptic number.

25761499571 is a deficient number, since it is larger than the sum of its proper divisors (1).

25761499571 is an equidigital number, since it uses as much as digits as its factorization.

25761499571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 56.

The spelling of 25761499571 in words is "twenty-five billion, seven hundred sixty-one million, four hundred ninety-nine thousand, five hundred seventy-one".