25121153117 has 2 divisors, whose sum is σ = 25121153118. Its totient is φ = 25121153116.

The previous prime is 25121153039. The next prime is 25121153137. The reversal of 25121153117 is 71135112152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15994407961 + 9126745156 = 126469^2 + 95534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25121153117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25121153117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25121153137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560576558 + 12560576559.

It is an arithmetic number, because the mean of its divisors is an integer number (12560576559).

Almost surely, 2^25121153117 is an apocalyptic number.

It is an amenable number.

25121153117 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121153117 is an equidigital number, since it uses as much as digits as its factorization.

25121153117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 29.

Adding to 25121153117 its reverse (71135112152), we get a palindrome (96256265269).

The spelling of 25121153117 in words is "twenty-five billion, one hundred twenty-one million, one hundred fifty-three thousand, one hundred seventeen".