622643666 has 16 divisors (see below), whose sum is σ = 992766456. Its totient is φ = 291864576.

The previous prime is 622643641. The next prime is 622643743. The reversal of 622643666 is 666346226.

It can be written as a sum of positive squares in 4 ways, for example, as 579413041 + 43230625 = 24071^2 + 6575^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26891 + ... + 44366.

Almost surely, 2^622643666 is an apocalyptic number.

622643666 is a deficient number, since it is larger than the sum of its proper divisors (370122790).

622643666 is a wasteful number, since it uses less digits than its factorization.

622643666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71533.

The product of its digits is 373248, while the sum is 41.

The square root of 622643666 is about 24952.8288175910. The cubic root of 622643666 is about 853.9121470103.

The spelling of 622643666 in words is "six hundred twenty-two million, six hundred forty-three thousand, six hundred sixty-six".