25049564819 has 2 divisors, whose sum is σ = 25049564820. Its totient is φ = 25049564818.

The previous prime is 25049564809. The next prime is 25049564857. The reversal of 25049564819 is 91846594052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25049564819 - 2⁴ = 25049564803 is a prime.

It is a super-2 number, since 2×25049564819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25049564809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12524782409 + 12524782410.

It is an arithmetic number, because the mean of its divisors is an integer number (12524782410).

Almost surely, 2^25049564819 is an apocalyptic number.

25049564819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25049564819 is an equidigital number, since it uses as much as digits as its factorization.

25049564819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 25049564819 in words is "twenty-five billion, forty-nine million, five hundred sixty-four thousand, eight hundred nineteen".