18999990001001 has 8 divisors (see below), whose sum is σ = 19128978394944. Its totient is φ = 18871043194800.

The previous prime is 18999990000989. The next prime is 18999990001051. The reversal of 18999990001001 is 10010009999981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18999990001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18999990001051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9479831 + ... + 11307836.

It is an arithmetic number, because the mean of its divisors is an integer number (2391122299368).

Almost surely, 2^{18999990001001} is an apocalyptic number.

It is an amenable number.

18999990001001 is a deficient number, since it is larger than the sum of its proper divisors (128988393943).

18999990001001 is a wasteful number, since it uses less digits than its factorization.

18999990001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793871.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 18999990001001 in words is "eighteen trillion, nine hundred ninety-nine billion, nine hundred ninety million, one thousand, one".