655672321 has 2 divisors, whose sum is σ = 655672322. Its totient is φ = 655672320.

The previous prime is 655672279. The next prime is 655672331. The reversal of 655672321 is 123276556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629457921 + 26214400 = 25089^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 655672321 - 2¹⁹ = 655148033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655672331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327836160 + 327836161.

It is an arithmetic number, because the mean of its divisors is an integer number (327836161).

Almost surely, 2^655672321 is an apocalyptic number.

It is an amenable number.

655672321 is a deficient number, since it is larger than the sum of its proper divisors (1).

655672321 is an equidigital number, since it uses as much as digits as its factorization.

655672321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 37.

The square root of 655672321 is about 25606.0992929419. The cubic root of 655672321 is about 868.7515987342.

The spelling of 655672321 in words is "six hundred fifty-five million, six hundred seventy-two thousand, three hundred twenty-one".