25493315678 has 8 divisors (see below), whose sum is σ = 38240700672. Its totient is φ = 12746415456.

The previous prime is 25493315633. The next prime is 25493315707. The reversal of 25493315678 is 87651339452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71651 + ... + 236897.

It is an arithmetic number, because the mean of its divisors is an integer number (4780087584).

Almost surely, 2^25493315678 is an apocalyptic number.

25493315678 is a deficient number, since it is larger than the sum of its proper divisors (12747384994).

25493315678 is a wasteful number, since it uses less digits than its factorization.

25493315678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242386.

The product of its digits is 5443200, while the sum is 53.

The spelling of 25493315678 in words is "twenty-five billion, four hundred ninety-three million, three hundred fifteen thousand, six hundred seventy-eight".