18290616721 has 8 divisors (see below), whose sum is σ = 19702678464. Its totient is φ = 16879282320.

The previous prime is 18290616677. The next prime is 18290616739. The reversal of 18290616721 is 12761609281.

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 18290616721 - 2²⁹ = 17753745809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18290646721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129031 + ... + 230716.

It is an arithmetic number, because the mean of its divisors is an integer number (2462834808).

Almost surely, 2^18290616721 is an apocalyptic number.

It is an amenable number.

18290616721 is a deficient number, since it is larger than the sum of its proper divisors (1412061743).

18290616721 is a wasteful number, since it uses less digits than its factorization.

18290616721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363671.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 18290616721 in words is "eighteen billion, two hundred ninety million, six hundred sixteen thousand, seven hundred twenty-one".