18608031921 has 8 divisors (see below), whose sum is σ = 26270162784. Its totient is φ = 11675627840.

The previous prime is 18608031877. The next prime is 18608031961. The reversal of 18608031921 is 12913080681.

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 18608031921 - 2¹³ = 18608023729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18608031921.

It is not an unprimeable number, because it can be changed into a prime (18608031961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182431635 + ... + 182431736.

It is an arithmetic number, because the mean of its divisors is an integer number (3283770348).

Almost surely, 2^18608031921 is an apocalyptic number.

It is an amenable number.

18608031921 is a deficient number, since it is larger than the sum of its proper divisors (7662130863).

18608031921 is a wasteful number, since it uses less digits than its factorization.

18608031921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364863391.

The product of its (nonzero) digits is 20736, while the sum is 39.

The spelling of 18608031921 in words is "eighteen billion, six hundred eight million, thirty-one thousand, nine hundred twenty-one".