25632687081 has 8 divisors (see below), whose sum is σ = 34515301824. Its totient is φ = 16919265200.

The previous prime is 25632687079. The next prime is 25632687109. The reversal of 25632687081 is 18078623652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25632687081 - 2¹ = 25632687079 is a prime.

It is a super-2 number, since 2×25632687081² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25632687081.

It is not an unprimeable number, because it can be changed into a prime (25632687281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42297861 + ... + 42298466.

It is an arithmetic number, because the mean of its divisors is an integer number (4314412728).

Almost surely, 2^25632687081 is an apocalyptic number.

It is an amenable number.

25632687081 is a deficient number, since it is larger than the sum of its proper divisors (8882614743).

25632687081 is a wasteful number, since it uses less digits than its factorization.

25632687081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84596431.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 25632687081 in words is "twenty-five billion, six hundred thirty-two million, six hundred eighty-seven thousand, eighty-one".