25166231819 has 2 divisors, whose sum is σ = 25166231820. Its totient is φ = 25166231818.

The previous prime is 25166231807. The next prime is 25166231821. The reversal of 25166231819 is 91813266152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25166231819 - 2⁴ = 25166231803 is a prime.

It is a super-2 number, since 2×25166231819² (a number of 22 digits) contains 22 as substring.

Together with 25166231821, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25166231819.

It is not a weakly prime, because it can be changed into another prime (25166231869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12583115909 + 12583115910.

It is an arithmetic number, because the mean of its divisors is an integer number (12583115910).

Almost surely, 2^25166231819 is an apocalyptic number.

25166231819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25166231819 is an equidigital number, since it uses as much as digits as its factorization.

25166231819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The spelling of 25166231819 in words is "twenty-five billion, one hundred sixty-six million, two hundred thirty-one thousand, eight hundred nineteen".