25666550123 has 2 divisors, whose sum is σ = 25666550124. Its totient is φ = 25666550122.

The previous prime is 25666550101. The next prime is 25666550131. The reversal of 25666550123 is 32105566652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25666550123 - 2²² = 25662355819 is a prime.

It is not a weakly prime, because it can be changed into another prime (25666550153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833275061 + 12833275062.

It is an arithmetic number, because the mean of its divisors is an integer number (12833275062).

Almost surely, 2^25666550123 is an apocalyptic number.

25666550123 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666550123 is an equidigital number, since it uses as much as digits as its factorization.

25666550123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 25666550123 in words is "twenty-five billion, six hundred sixty-six million, five hundred fifty thousand, one hundred twenty-three".