18993064697 has 4 divisors (see below), whose sum is σ = 19434763920. Its totient is φ = 18551365476.

The previous prime is 18993064693. The next prime is 18993064703. The reversal of 18993064697 is 79646039981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18993064697 - 2² = 18993064693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18993064693) 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 3 ways as a sum of consecutive naturals, for example, 220849547 + ... + 220849632.

It is an arithmetic number, because the mean of its divisors is an integer number (4858690980).

Almost surely, 2^18993064697 is an apocalyptic number.

It is an amenable number.

18993064697 is a deficient number, since it is larger than the sum of its proper divisors (441699223).

18993064697 is an equidigital number, since it uses as much as digits as its factorization.

18993064697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441699222.

The product of its (nonzero) digits is 17635968, while the sum is 62.

The spelling of 18993064697 in words is "eighteen billion, nine hundred ninety-three million, sixty-four thousand, six hundred ninety-seven".