25535623649 has 8 divisors (see below), whose sum is σ = 26194855680. Its totient is φ = 24878125600.

The previous prime is 25535623621. The next prime is 25535623651. The reversal of 25535623649 is 94632653552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25535623649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25535623597 and 25535623606.

It is not an unprimeable number, because it can be changed into a prime (25535623609) 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 7 ways as a sum of consecutive naturals, for example, 403637 + ... + 462594.

It is an arithmetic number, because the mean of its divisors is an integer number (3274356960).

Almost surely, 2^25535623649 is an apocalyptic number.

It is an amenable number.

25535623649 is a deficient number, since it is larger than the sum of its proper divisors (659232031).

25535623649 is an equidigital number, since it uses as much as digits as its factorization.

25535623649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866991.

The product of its digits is 5832000, while the sum is 50.

The spelling of 25535623649 in words is "twenty-five billion, five hundred thirty-five million, six hundred twenty-three thousand, six hundred forty-nine".