25821984667 has 8 divisors (see below), whose sum is σ = 26269931520. Its totient is φ = 25377296040.

The previous prime is 25821984647. The next prime is 25821984689. The reversal of 25821984667 is 76648912852.

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 25821984667 - 2²⁷ = 25687766939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25821984647) 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, 798567 + ... + 830272.

It is an arithmetic number, because the mean of its divisors is an integer number (3283741440).

Almost surely, 2^25821984667 is an apocalyptic number.

25821984667 is a deficient number, since it is larger than the sum of its proper divisors (447946853).

25821984667 is a wasteful number, since it uses less digits than its factorization.

25821984667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629113.

The product of its digits is 11612160, while the sum is 58.

The spelling of 25821984667 in words is "twenty-five billion, eight hundred twenty-one million, nine hundred eighty-four thousand, six hundred sixty-seven".