1820655901663 has 2 divisors, whose sum is σ = 1820655901664. Its totient is φ = 1820655901662.

The previous prime is 1820655901633. The next prime is 1820655901747. The reversal of 1820655901663 is 3661095560281.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820655901663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820655901663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820655901633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910327950831 + 910327950832.

It is an arithmetic number, because the mean of its divisors is an integer number (910327950832).

Almost surely, 2^{1820655901663} is an apocalyptic number.

1820655901663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820655901663 is an equidigital number, since it uses as much as digits as its factorization.

1820655901663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 1820655901663 in words is "one trillion, eight hundred twenty billion, six hundred fifty-five million, nine hundred one thousand, six hundred sixty-three".