622216661 has 16 divisors (see below), whose sum is σ = 698502528. Its totient is φ = 549432000.

The previous prime is 622216627. The next prime is 622216687. The reversal of 622216661 is 166612226.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-622216661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622216601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53600 + ... + 64166.

It is an arithmetic number, because the mean of its divisors is an integer number (43656408).

Almost surely, 2^622216661 is an apocalyptic number.

It is an amenable number.

622216661 is a deficient number, since it is larger than the sum of its proper divisors (76285867).

622216661 is a wasteful number, since it uses less digits than its factorization.

622216661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10732.

The product of its digits is 10368, while the sum is 32.

The square root of 622216661 is about 24944.2711058070. The cubic root of 622216661 is about 853.7168998941.

Adding to 622216661 its reverse (166612226), we get a palindrome (788828887).

The spelling of 622216661 in words is "six hundred twenty-two million, two hundred sixteen thousand, six hundred sixty-one".