1647623041817 has 2 divisors, whose sum is σ = 1647623041818. Its totient is φ = 1647623041816.

The previous prime is 1647623041789. The next prime is 1647623041849. The reversal of 1647623041817 is 7181403267461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1636240072336 + 11382969481 = 1279156^2 + 106691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1647623041817 is a prime.

It is a super-2 number, since 2×1647623041817² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1647623047817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823811520908 + 823811520909.

It is an arithmetic number, because the mean of its divisors is an integer number (823811520909).

Almost surely, 2^{1647623041817} is an apocalyptic number.

It is an amenable number.

1647623041817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647623041817 is an equidigital number, since it uses as much as digits as its factorization.

1647623041817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 1647623041817 in words is "one trillion, six hundred forty-seven billion, six hundred twenty-three million, forty-one thousand, eight hundred seventeen".