18981467986 has 32 divisors (see below), whose sum is σ = 30930480000. Its totient is φ = 8684323200.

The previous prime is 18981467983. The next prime is 18981467993. The reversal of 18981467986 is 68976418981.

It is a super-2 number, since 2×18981467986² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18981467983) 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 15 ways as a sum of consecutive naturals, for example, 1954230 + ... + 1963918.

It is an arithmetic number, because the mean of its divisors is an integer number (966577500).

Almost surely, 2^18981467986 is an apocalyptic number.

18981467986 is a deficient number, since it is larger than the sum of its proper divisors (11949012014).

18981467986 is a wasteful number, since it uses less digits than its factorization.

18981467986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10354.

The product of its digits is 41803776, while the sum is 67.

The spelling of 18981467986 in words is "eighteen billion, nine hundred eighty-one million, four hundred sixty-seven thousand, nine hundred eighty-six".