25405331123 has 2 divisors, whose sum is σ = 25405331124. Its totient is φ = 25405331122.

The previous prime is 25405331113. The next prime is 25405331137. The reversal of 25405331123 is 32113350452.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25405331123 - 2¹⁸ = 25405068979 is a prime.

It is a super-2 number, since 2×25405331123² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25405331113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702665561 + 12702665562.

It is an arithmetic number, because the mean of its divisors is an integer number (12702665562).

Almost surely, 2^25405331123 is an apocalyptic number.

25405331123 is a deficient number, since it is larger than the sum of its proper divisors (1).

25405331123 is an equidigital number, since it uses as much as digits as its factorization.

25405331123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 25405331123 its reverse (32113350452), we get a palindrome (57518681575).

The spelling of 25405331123 in words is "twenty-five billion, four hundred five million, three hundred thirty-one thousand, one hundred twenty-three".