25142253509 has 4 divisors (see below), whose sum is σ = 25214294700. Its totient is φ = 25070212320.

The previous prime is 25142253497. The next prime is 25142253517. The reversal of 25142253509 is 90535224152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13901589025 + 11240664484 = 117905^2 + 106022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25142253509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25142273509) 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 in 3 ways as a sum of consecutive naturals, for example, 36020072 + ... + 36020769.

It is an arithmetic number, because the mean of its divisors is an integer number (6303573675).

Almost surely, 2^25142253509 is an apocalyptic number.

It is an amenable number.

25142253509 is a deficient number, since it is larger than the sum of its proper divisors (72041191).

25142253509 is an equidigital number, since it uses as much as digits as its factorization.

25142253509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72041190.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 25142253509 in words is "twenty-five billion, one hundred forty-two million, two hundred fifty-three thousand, five hundred nine".