25816534907 has 4 divisors (see below), whose sum is σ = 25927335720. Its totient is φ = 25705734096.

The previous prime is 25816534901. The next prime is 25816534967. The reversal of 25816534907 is 70943561852.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25816534907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25816534901) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 55400057 + ... + 55400522.

It is an arithmetic number, because the mean of its divisors is an integer number (6481833930).

It is a 1-persistent number, because it is pandigital, but 2⋅25816534907 = 51633069814 is not.

Almost surely, 2^25816534907 is an apocalyptic number.

25816534907 is a deficient number, since it is larger than the sum of its proper divisors (110800813).

25816534907 is a wasteful number, since it uses less digits than its factorization.

25816534907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110800812.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 25816534907 in words is "twenty-five billion, eight hundred sixteen million, five hundred thirty-four thousand, nine hundred seven".