25493666378 has 32 divisors (see below), whose sum is σ = 40794513408. Its totient is φ = 11907078400.

The previous prime is 25493666329. The next prime is 25493666413. The reversal of 25493666378 is 87366639452.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2882423 + ... + 2891253.

It is an arithmetic number, because the mean of its divisors is an integer number (1274828544).

Almost surely, 2^25493666378 is an apocalyptic number.

25493666378 is a deficient number, since it is larger than the sum of its proper divisors (15300847030).

25493666378 is a wasteful number, since it uses less digits than its factorization.

25493666378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478.

The product of its digits is 39191040, while the sum is 59.

The spelling of 25493666378 in words is "twenty-five billion, four hundred ninety-three million, six hundred sixty-six thousand, three hundred seventy-eight".