25812391394 has 4 divisors (see below), whose sum is σ = 38718587094. Its totient is φ = 12906195696.

The previous prime is 25812391379. The next prime is 25812391417. The reversal of 25812391394 is 49319321852.

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., 25810029025 + 2362369 = 160655^2 + 1537^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6453097847 + ... + 6453097850.

Almost surely, 2^25812391394 is an apocalyptic number.

25812391394 is a deficient number, since it is larger than the sum of its proper divisors (12906195700).

25812391394 is a wasteful number, since it uses less digits than its factorization.

25812391394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906195699.

The product of its digits is 466560, while the sum is 47.

The spelling of 25812391394 in words is "twenty-five billion, eight hundred twelve million, three hundred ninety-one thousand, three hundred ninety-four".