25378391807 has 4 divisors (see below), whose sum is σ = 25379368560. Its totient is φ = 25377415056.

The previous prime is 25378391803. The next prime is 25378391821. The reversal of 25378391807 is 70819387352.

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

It is a cyclic number.

It is not a de Polignac number, because 25378391807 - 2² = 25378391803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25378391803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448307 + ... + 501732.

It is an arithmetic number, because the mean of its divisors is an integer number (6344842140).

Almost surely, 2^25378391807 is an apocalyptic number.

25378391807 is a deficient number, since it is larger than the sum of its proper divisors (976753).

25378391807 is an equidigital number, since it uses as much as digits as its factorization.

25378391807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976752.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 25378391807 in words is "twenty-five billion, three hundred seventy-eight million, three hundred ninety-one thousand, eight hundred seven".