321625605617 has 2 divisors, whose sum is σ = 321625605618. Its totient is φ = 321625605616.

The previous prime is 321625605557. The next prime is 321625605661. The reversal of 321625605617 is 716506526123.

It is a happy number.

It is an a-pointer prime, because the next prime (321625605661) can be obtained adding 321625605617 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289090104241 + 32535501376 = 537671^2 + 180376^2 .

It is a cyclic number.

It is not a de Polignac number, because 321625605617 - 2²² = 321621411313 is a prime.

It is not a weakly prime, because it can be changed into another prime (321625604617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160812802808 + 160812802809.

It is an arithmetic number, because the mean of its divisors is an integer number (160812802809).

Almost surely, 2^321625605617 is an apocalyptic number.

It is an amenable number.

321625605617 is a deficient number, since it is larger than the sum of its proper divisors (1).

321625605617 is an equidigital number, since it uses as much as digits as its factorization.

321625605617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 321625605617 in words is "three hundred twenty-one billion, six hundred twenty-five million, six hundred five thousand, six hundred seventeen".