18964771678 has 4 divisors (see below), whose sum is σ = 28447157520. Its totient is φ = 9482385838.

The previous prime is 18964771673. The next prime is 18964771711. The reversal of 18964771678 is 87617746981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18964771673) 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 as a sum of consecutive naturals, namely, 4741192918 + ... + 4741192921.

It is an arithmetic number, because the mean of its divisors is an integer number (7111789380).

Almost surely, 2^18964771678 is an apocalyptic number.

18964771678 is a deficient number, since it is larger than the sum of its proper divisors (9482385842).

18964771678 is an equidigital number, since it uses as much as digits as its factorization.

18964771678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9482385841.

The product of its digits is 28449792, while the sum is 64.

The spelling of 18964771678 in words is "eighteen billion, nine hundred sixty-four million, seven hundred seventy-one thousand, six hundred seventy-eight".