25891377378 has 64 divisors (see below), whose sum is σ = 52738936320. Its totient is φ = 8473102848.

The previous prime is 25891377361. The next prime is 25891377389. The reversal of 25891377378 is 87377319852.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38471250 + ... + 38471922.

It is an arithmetic number, because the mean of its divisors is an integer number (824045880).

Almost surely, 2^25891377378 is an apocalyptic number.

25891377378 is an abundant number, since it is smaller than the sum of its proper divisors (26847558942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25891377378 is a wasteful number, since it uses less digits than its factorization.

25891377378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263.

The product of its digits is 17781120, while the sum is 60.

The spelling of 25891377378 in words is "twenty-five billion, eight hundred ninety-one million, three hundred seventy-seven thousand, three hundred seventy-eight".