18897424818 has 16 divisors (see below), whose sum is σ = 39438104256. Its totient is φ = 6025265840.

The previous prime is 18897424813. The next prime is 18897424837. The reversal of 18897424818 is 81842479881.

It is a super-2 number, since 2×18897424818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18897424813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68468793 + ... + 68469068.

It is an arithmetic number, because the mean of its divisors is an integer number (2464881516).

Almost surely, 2^18897424818 is an apocalyptic number.

18897424818 is an abundant number, since it is smaller than the sum of its proper divisors (20540679438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18897424818 is a wasteful number, since it uses less digits than its factorization.

18897424818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136937889.

The product of its digits is 8257536, while the sum is 60.

The spelling of 18897424818 in words is "eighteen billion, eight hundred ninety-seven million, four hundred twenty-four thousand, eight hundred eighteen".