25185617123 has 2 divisors, whose sum is σ = 25185617124. Its totient is φ = 25185617122.

The previous prime is 25185617099. The next prime is 25185617129. The reversal of 25185617123 is 32171658152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25185617123 - 2⁶ = 25185617059 is a prime.

It is not a weakly prime, because it can be changed into another prime (25185617129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12592808561 + 12592808562.

It is an arithmetic number, because the mean of its divisors is an integer number (12592808562).

Almost surely, 2^25185617123 is an apocalyptic number.

25185617123 is a deficient number, since it is larger than the sum of its proper divisors (1).

25185617123 is an equidigital number, since it uses as much as digits as its factorization.

25185617123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The spelling of 25185617123 in words is "twenty-five billion, one hundred eighty-five million, six hundred seventeen thousand, one hundred twenty-three".