18055721793 has 8 divisors (see below), whose sum is σ = 25341364000. Its totient is φ = 11403613728.

The previous prime is 18055721711. The next prime is 18055721807. The reversal of 18055721793 is 39712755081.

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

It is not a de Polignac number, because 18055721793 - 2¹⁸ = 18055459649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18055721293) 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, 158383468 + ... + 158383581.

It is an arithmetic number, because the mean of its divisors is an integer number (3167670500).

Almost surely, 2^18055721793 is an apocalyptic number.

It is an amenable number.

18055721793 is a deficient number, since it is larger than the sum of its proper divisors (7285642207).

18055721793 is a wasteful number, since it uses less digits than its factorization.

18055721793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316767071.

The product of its (nonzero) digits is 529200, while the sum is 48.

The spelling of 18055721793 in words is "eighteen billion, fifty-five million, seven hundred twenty-one thousand, seven hundred ninety-three".