18721472751309 has 8 divisors (see below), whose sum is σ = 25065540282112. Its totient is φ = 12429193527360.

The previous prime is 18721472751307. The next prime is 18721472751347. The reversal of 18721472751309 is 90315727412781.

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

It is not a de Polignac number, because 18721472751309 - 2¹ = 18721472751307 is a prime.

It is a super-2 number, since 2×18721472751309² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18721472751307) 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, 12947075869 + ... + 12947077314.

It is an arithmetic number, because the mean of its divisors is an integer number (3133192535264).

Almost surely, 2^{18721472751309} is an apocalyptic number.

It is an amenable number.

18721472751309 is a deficient number, since it is larger than the sum of its proper divisors (6344067530803).

18721472751309 is a wasteful number, since it uses less digits than its factorization.

18721472751309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25894153427.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 18721472751309 in words is "eighteen trillion, seven hundred twenty-one billion, four hundred seventy-two million, seven hundred fifty-one thousand, three hundred nine".