18449945693 has 8 divisors (see below), whose sum is σ = 18632217888. Its totient is φ = 18267855984.

The previous prime is 18449945671. The next prime is 18449945777. The reversal of 18449945693 is 39654994481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18449945693 - 2¹² = 18449941597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18449941693) 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, 162230 + ... + 251432.

It is an arithmetic number, because the mean of its divisors is an integer number (2329027236).

Almost surely, 2^18449945693 is an apocalyptic number.

It is an amenable number.

18449945693 is a deficient number, since it is larger than the sum of its proper divisors (182272195).

18449945693 is a wasteful number, since it uses less digits than its factorization.

18449945693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91243.

The product of its digits is 33592320, while the sum is 62.

The spelling of 18449945693 in words is "eighteen billion, four hundred forty-nine million, nine hundred forty-five thousand, six hundred ninety-three".