321660420677 has 2 divisors, whose sum is σ = 321660420678. Its totient is φ = 321660420676.

The previous prime is 321660420623. The next prime is 321660420701. The reversal of 321660420677 is 776024066123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278194008481 + 43466412196 = 527441^2 + 208486^2 .

It is a cyclic number.

It is not a de Polignac number, because 321660420677 - 2¹⁰ = 321660419653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321660420377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160830210338 + 160830210339.

It is an arithmetic number, because the mean of its divisors is an integer number (160830210339).

Almost surely, 2^321660420677 is an apocalyptic number.

It is an amenable number.

321660420677 is a deficient number, since it is larger than the sum of its proper divisors (1).

321660420677 is an equidigital number, since it uses as much as digits as its factorization.

321660420677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 321660420677 in words is "three hundred twenty-one billion, six hundred sixty million, four hundred twenty thousand, six hundred seventy-seven".