18033796639 has 4 divisors (see below), whose sum is σ = 19094608224. Its totient is φ = 16972985056.

The previous prime is 18033796631. The next prime is 18033796661. The reversal of 18033796639 is 93669733081.

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

It is a cyclic number.

It is not a de Polignac number, because 18033796639 - 2³ = 18033796631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18033796639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18033796631) 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 3 ways as a sum of consecutive naturals, for example, 530405767 + ... + 530405800.

It is an arithmetic number, because the mean of its divisors is an integer number (4773652056).

Almost surely, 2^18033796639 is an apocalyptic number.

18033796639 is a deficient number, since it is larger than the sum of its proper divisors (1060811585).

18033796639 is a wasteful number, since it uses less digits than its factorization.

18033796639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060811584.

The product of its (nonzero) digits is 4408992, while the sum is 55.

The spelling of 18033796639 in words is "eighteen billion, thirty-three million, seven hundred ninety-six thousand, six hundred thirty-nine".