25645930243 has 4 divisors (see below), whose sum is σ = 25646380288. Its totient is φ = 25645480200.

The previous prime is 25645930231. The next prime is 25645930253. The reversal of 25645930243 is 34203954652.

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

It is a cyclic number.

It is not a de Polignac number, because 25645930243 - 2²¹ = 25643833091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25645930243.

It is not an unprimeable number, because it can be changed into a prime (25645930253) 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, 124608 + ... + 258493.

It is an arithmetic number, because the mean of its divisors is an integer number (6411595072).

Almost surely, 2^25645930243 is an apocalyptic number.

25645930243 is a deficient number, since it is larger than the sum of its proper divisors (450045).

25645930243 is an equidigital number, since it uses as much as digits as its factorization.

25645930243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450044.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 25645930243 in words is "twenty-five billion, six hundred forty-five million, nine hundred thirty thousand, two hundred forty-three".