25154768909 has 4 divisors (see below), whose sum is σ = 25768299900. Its totient is φ = 24541237920.

The previous prime is 25154768887. The next prime is 25154768911. The reversal of 25154768909 is 90986745152.

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 4597518025 + 20557250884 = 67805^2 + 143378^2 .

It is a cyclic number.

It is not a de Polignac number, because 25154768909 - 2¹² = 25154764813 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 (25154768939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306765434 + ... + 306765515.

It is an arithmetic number, because the mean of its divisors is an integer number (6442074975).

Almost surely, 2^25154768909 is an apocalyptic number.

It is an amenable number.

25154768909 is a deficient number, since it is larger than the sum of its proper divisors (613530991).

25154768909 is an equidigital number, since it uses as much as digits as its factorization.

25154768909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613530990.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 25154768909 in words is "twenty-five billion, one hundred fifty-four million, seven hundred sixty-eight thousand, nine hundred nine".