18766916945 has 24 divisors (see below), whose sum is σ = 26214338304. Its totient is φ = 12860267616.

The previous prime is 18766916941. The next prime is 18766916957. The reversal of 18766916945 is 54961966781.

It is not a de Polignac number, because 18766916945 - 2² = 18766916941 is a prime.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18766916941) 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, 359474 + ... + 408356.

It is an arithmetic number, because the mean of its divisors is an integer number (1092264096).

Almost surely, 2^18766916945 is an apocalyptic number.

It is an amenable number.

18766916945 is a deficient number, since it is larger than the sum of its proper divisors (7447421359).

18766916945 is a wasteful number, since it uses less digits than its factorization.

18766916945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50469 (or 50462 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 62.

The spelling of 18766916945 in words is "eighteen billion, seven hundred sixty-six million, nine hundred sixteen thousand, nine hundred forty-five".