25816772378 has 16 divisors (see below), whose sum is σ = 39017246184. Its totient is φ = 12811069440.

The previous prime is 25816772357. The next prime is 25816772381. The reversal of 25816772378 is 87327761852.

It can be written as a sum of positive squares in 4 ways, for example, as 25781761489 + 35010889 = 160567^2 + 5917^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482176 + ... + 1499492.

Almost surely, 2^25816772378 is an apocalyptic number.

25816772378 is a deficient number, since it is larger than the sum of its proper divisors (13200473806).

25816772378 is a wasteful number, since it uses less digits than its factorization.

25816772378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22897.

The product of its digits is 7902720, while the sum is 56.

The spelling of 25816772378 in words is "twenty-five billion, eight hundred sixteen million, seven hundred seventy-two thousand, three hundred seventy-eight".