25709707378 has 4 divisors (see below), whose sum is σ = 38564561070. Its totient is φ = 12854853688.

The previous prime is 25709707337. The next prime is 25709707381. The reversal of 25709707378 is 87370790752.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 22578969169 + 3130738209 = 150263^2 + 55953^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6427426843 + ... + 6427426846.

Almost surely, 2^25709707378 is an apocalyptic number.

25709707378 is a deficient number, since it is larger than the sum of its proper divisors (12854853692).

25709707378 is a wasteful number, since it uses less digits than its factorization.

25709707378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12854853691.

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 25709707378 in words is "twenty-five billion, seven hundred nine million, seven hundred seven thousand, three hundred seventy-eight".