18201001001947 has 2 divisors, whose sum is σ = 18201001001948. Its totient is φ = 18201001001946.

The previous prime is 18201001001863. The next prime is 18201001001969. The reversal of 18201001001947 is 74910010010281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18201001001947 - 2⁷ = 18201001001819 is a prime.

It is not a weakly prime, because it can be changed into another prime (18201061001947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9100500500973 + 9100500500974.

It is an arithmetic number, because the mean of its divisors is an integer number (9100500500974).

Almost surely, 2^{18201001001947} is an apocalyptic number.

18201001001947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18201001001947 is an equidigital number, since it uses as much as digits as its factorization.

18201001001947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 18201001001947 in words is "eighteen trillion, two hundred one billion, one million, one thousand, nine hundred forty-seven".