18825961817 has 8 divisors (see below), whose sum is σ = 21155596224. Its totient is φ = 16622253648.

The previous prime is 18825961801. The next prime is 18825961837. The reversal of 18825961817 is 71816952881.

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

It is not a de Polignac number, because 18825961817 - 2⁴ = 18825961801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18825961837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31481243 + ... + 31481840.

It is an arithmetic number, because the mean of its divisors is an integer number (2644449528).

Almost surely, 2^18825961817 is an apocalyptic number.

It is an amenable number.

18825961817 is a deficient number, since it is larger than the sum of its proper divisors (2329634407).

18825961817 is a wasteful number, since it uses less digits than its factorization.

18825961817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62963119.

The product of its digits is 1935360, while the sum is 56.

The spelling of 18825961817 in words is "eighteen billion, eight hundred twenty-five million, nine hundred sixty-one thousand, eight hundred seventeen".