25665850394 has 4 divisors (see below), whose sum is σ = 38498775594. Its totient is φ = 12832925196.

The previous prime is 25665850393. The next prime is 25665850411. The reversal of 25665850394 is 49305856652.

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

It can be written as a sum of positive squares in only one way, i.e., 13408482025 + 12257368369 = 115795^2 + 110713^2 .

It is not an unprimeable number, because it can be changed into a prime (25665850393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6416462597 + ... + 6416462600.

Almost surely, 2^25665850394 is an apocalyptic number.

25665850394 is a deficient number, since it is larger than the sum of its proper divisors (12832925200).

25665850394 is a wasteful number, since it uses less digits than its factorization.

25665850394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832925199.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 25665850394 in words is "twenty-five billion, six hundred sixty-five million, eight hundred fifty thousand, three hundred ninety-four".