18972972467 has 2 divisors, whose sum is σ = 18972972468. Its totient is φ = 18972972466.

The previous prime is 18972972449. The next prime is 18972972493. The reversal of 18972972467 is 76427927981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18972972467 - 2⁸ = 18972972211 is a prime.

It is not a weakly prime, because it can be changed into another prime (18972902467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486486233 + 9486486234.

It is an arithmetic number, because the mean of its divisors is an integer number (9486486234).

Almost surely, 2^18972972467 is an apocalyptic number.

18972972467 is a deficient number, since it is larger than the sum of its proper divisors (1).

18972972467 is an equidigital number, since it uses as much as digits as its factorization.

18972972467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 62.

The spelling of 18972972467 in words is "eighteen billion, nine hundred seventy-two million, nine hundred seventy-two thousand, four hundred sixty-seven".