18870872408473 has 2 divisors, whose sum is σ = 18870872408474. Its totient is φ = 18870872408472.

The previous prime is 18870872408419. The next prime is 18870872408483. The reversal of 18870872408473 is 37480427807881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18862413375744 + 8459032729 = 4343088^2 + 91973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18870872408473 is a prime.

It is a super-2 number, since 2×18870872408473² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18870872408399 and 18870872408408.

It is not a weakly prime, because it can be changed into another prime (18870872408483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435436204236 + 9435436204237.

It is an arithmetic number, because the mean of its divisors is an integer number (9435436204237).

Almost surely, 2^{18870872408473} is an apocalyptic number.

It is an amenable number.

18870872408473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18870872408473 is an equidigital number, since it uses as much as digits as its factorization.

18870872408473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134873088, while the sum is 67.

The spelling of 18870872408473 in words is "eighteen trillion, eight hundred seventy billion, eight hundred seventy-two million, four hundred eight thousand, four hundred seventy-three".