25601616008 has 8 divisors (see below), whose sum is σ = 48003030030. Its totient is φ = 12800808000.

The previous prime is 25601615971. The next prime is 25601616013. The reversal of 25601616008 is 80061610652.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25599360004 + 2256004 = 159998^2 + 1502^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600100993 + ... + 1600101008.

Almost surely, 2^25601616008 is an apocalyptic number.

It is an amenable number.

25601616008 is a deficient number, since it is larger than the sum of its proper divisors (22401414022).

25601616008 is a wasteful number, since it uses less digits than its factorization.

25601616008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200202007 (or 3200202003 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 25601616008 in words is "twenty-five billion, six hundred one million, six hundred sixteen thousand, eight".