321997863693763 has 2 divisors, whose sum is σ = 321997863693764. Its totient is φ = 321997863693762.

The previous prime is 321997863693689. The next prime is 321997863693773. The reversal of 321997863693763 is 367396368799123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321997863693763 - 2⁹ = 321997863693251 is a prime.

It is not a weakly prime, because it can be changed into another prime (321997863693773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160998931846881 + 160998931846882.

It is an arithmetic number, because the mean of its divisors is an integer number (160998931846882).

Almost surely, 2^{321997863693763} is an apocalyptic number.

321997863693763 is a deficient number, since it is larger than the sum of its proper divisors (1).

321997863693763 is an equidigital number, since it uses as much as digits as its factorization.

321997863693763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9999593856, while the sum is 82.

The spelling of 321997863693763 in words is "three hundred twenty-one trillion, nine hundred ninety-seven billion, eight hundred sixty-three million, six hundred ninety-three thousand, seven hundred sixty-three".