18721472751347 has 2 divisors, whose sum is σ = 18721472751348. Its totient is φ = 18721472751346.

The previous prime is 18721472751307. The next prime is 18721472751409. The reversal of 18721472751347 is 74315727412781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18721472751347 - 2³⁶ = 18652753274611 is a prime.

It is not a weakly prime, because it can be changed into another prime (18721472751307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9360736375673 + 9360736375674.

It is an arithmetic number, because the mean of its divisors is an integer number (9360736375674).

Almost surely, 2^{18721472751347} is an apocalyptic number.

18721472751347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18721472751347 is an equidigital number, since it uses as much as digits as its factorization.

18721472751347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18439680, while the sum is 59.

The spelling of 18721472751347 in words is "eighteen trillion, seven hundred twenty-one billion, four hundred seventy-two million, seven hundred fifty-one thousand, three hundred forty-seven".