622951661 has 2 divisors, whose sum is σ = 622951662. Its totient is φ = 622951660.

The previous prime is 622951643. The next prime is 622951691. The reversal of 622951661 is 166159226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367910761 + 255040900 = 19181^2 + 15970^2 .

It is a cyclic number.

It is not a de Polignac number, because 622951661 - 2⁶ = 622951597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622951601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311475830 + 311475831.

It is an arithmetic number, because the mean of its divisors is an integer number (311475831).

Almost surely, 2^622951661 is an apocalyptic number.

It is an amenable number.

622951661 is a deficient number, since it is larger than the sum of its proper divisors (1).

622951661 is an equidigital number, since it uses as much as digits as its factorization.

622951661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 622951661 is about 24958.9995993429. Note that the first 3 decimals coincide. The cubic root of 622951661 is about 854.0529216528.

The spelling of 622951661 in words is "six hundred twenty-two million, nine hundred fifty-one thousand, six hundred sixty-one".