25259297278 has 4 divisors (see below), whose sum is σ = 37888945920. Its totient is φ = 12629648638.

The previous prime is 25259297267. The next prime is 25259297303. The reversal of 25259297278 is 87279295252.

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

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6314824318 + ... + 6314824321.

It is an arithmetic number, because the mean of its divisors is an integer number (9472236480).

Almost surely, 2^25259297278 is an apocalyptic number.

25259297278 is a deficient number, since it is larger than the sum of its proper divisors (12629648642).

25259297278 is a wasteful number, since it uses less digits than its factorization.

25259297278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12629648641.

The product of its digits is 12700800, while the sum is 58.

The spelling of 25259297278 in words is "twenty-five billion, two hundred fifty-nine million, two hundred ninety-seven thousand, two hundred seventy-eight".