25457068478 has 4 divisors (see below), whose sum is σ = 38185602720. Its totient is φ = 12728534238.

The previous prime is 25457068381. The next prime is 25457068493. The reversal of 25457068478 is 87486075452.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364267118 + ... + 6364267121.

It is an arithmetic number, because the mean of its divisors is an integer number (9546400680).

Almost surely, 2^25457068478 is an apocalyptic number.

25457068478 is a deficient number, since it is larger than the sum of its proper divisors (12728534242).

25457068478 is a wasteful number, since it uses less digits than its factorization.

25457068478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12728534241.

The product of its (nonzero) digits is 15052800, while the sum is 56.

The spelling of 25457068478 in words is "twenty-five billion, four hundred fifty-seven million, sixty-eight thousand, four hundred seventy-eight".