321604314251657 has 2 divisors, whose sum is σ = 321604314251658. Its totient is φ = 321604314251656.

The previous prime is 321604314251599. The next prime is 321604314251663. The reversal of 321604314251657 is 756152413406123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277468275149641 + 44136039102016 = 16657379^2 + 6643496^2 .

It is a cyclic number.

It is not a de Polignac number, because 321604314251657 - 2¹⁶ = 321604314186121 is a prime.

It is not a weakly prime, because it can be changed into another prime (321604314257657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160802157125828 + 160802157125829.

It is an arithmetic number, because the mean of its divisors is an integer number (160802157125829).

Almost surely, 2^{321604314251657} is an apocalyptic number.

It is an amenable number.

321604314251657 is a deficient number, since it is larger than the sum of its proper divisors (1).

321604314251657 is an equidigital number, since it uses as much as digits as its factorization.

321604314251657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 321604314251657 in words is "three hundred twenty-one trillion, six hundred four billion, three hundred fourteen million, two hundred fifty-one thousand, six hundred fifty-seven".