18984775797 has 24 divisors (see below), whose sum is σ = 29539036800. Its totient is φ = 11680105248.

The previous prime is 18984775783. The next prime is 18984775841. The reversal of 18984775797 is 79757748981.

18984775797 is a `hidden beast` number, since 1 + 8 + 9 + 8 + 47 + 7 + 579 + 7 = 666.

It is not a de Polignac number, because 18984775797 - 2⁴ = 18984775781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18984775757) 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 23 ways as a sum of consecutive naturals, for example, 530104 + ... + 564782.

It is an arithmetic number, because the mean of its divisors is an integer number (1230793200).

Almost surely, 2^18984775797 is an apocalyptic number.

It is an amenable number.

18984775797 is a deficient number, since it is larger than the sum of its proper divisors (10554261003).

18984775797 is a wasteful number, since it uses less digits than its factorization.

18984775797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39377 (or 39374 counting only the distinct ones).

The product of its digits is 248935680, while the sum is 72.

The spelling of 18984775797 in words is "eighteen billion, nine hundred eighty-four million, seven hundred seventy-five thousand, seven hundred ninety-seven".