18386385634981 has 8 divisors (see below), whose sum is σ = 22629397704704. Its totient is φ = 14547469952880.

The previous prime is 18386385634979. The next prime is 18386385635081. The reversal of 18386385634981 is 18943658368381.

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 18386385634981 - 2¹ = 18386385634979 is a prime.

It is a super-2 number, since 2×18386385634981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18386385634951) 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, 101024096805 + ... + 101024096986.

It is an arithmetic number, because the mean of its divisors is an integer number (2828674713088).

Almost surely, 2^{18386385634981} is an apocalyptic number.

It is an amenable number.

18386385634981 is a deficient number, since it is larger than the sum of its proper divisors (4243012069723).

18386385634981 is a wasteful number, since it uses less digits than its factorization.

18386385634981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202048193811.

The product of its digits is 716636160, while the sum is 73.

The spelling of 18386385634981 in words is "eighteen trillion, three hundred eighty-six billion, three hundred eighty-five million, six hundred thirty-four thousand, nine hundred eighty-one".