25523154121 has 2 divisors, whose sum is σ = 25523154122. Its totient is φ = 25523154120.

The previous prime is 25523154101. The next prime is 25523154169. The reversal of 25523154121 is 12145132552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13737012025 + 11786142096 = 117205^2 + 108564^2 .

It is a cyclic number.

It is not a de Polignac number, because 25523154121 - 2⁷ = 25523153993 is a prime.

It is not a weakly prime, because it can be changed into another prime (25523154101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12761577060 + 12761577061.

It is an arithmetic number, because the mean of its divisors is an integer number (12761577061).

Almost surely, 2^25523154121 is an apocalyptic number.

It is an amenable number.

25523154121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25523154121 is an equidigital number, since it uses as much as digits as its factorization.

25523154121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 31.

Adding to 25523154121 its reverse (12145132552), we get a palindrome (37668286673).

The spelling of 25523154121 in words is "twenty-five billion, five hundred twenty-three million, one hundred fifty-four thousand, one hundred twenty-one".