622544661 has 6 divisors (see below), whose sum is σ = 899231190. Its totient is φ = 415029768.

The previous prime is 622544651. The next prime is 622544677. The reversal of 622544661 is 166445226.

It can be written as a sum of positive squares in only one way, i.e., 471107025 + 151437636 = 21705^2 + 12306^2 .

It is not a de Polignac number, because 622544661 - 2¹⁸ = 622282517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622544621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34585806 + ... + 34585823.

It is an arithmetic number, because the mean of its divisors is an integer number (149871865).

Almost surely, 2^622544661 is an apocalyptic number.

It is an amenable number.

622544661 is a deficient number, since it is larger than the sum of its proper divisors (276686529).

622544661 is a wasteful number, since it uses less digits than its factorization.

622544661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69171635 (or 69171632 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 622544661 is about 24950.8448955141. The cubic root of 622544661 is about 853.8668851384.

Adding to 622544661 its reverse (166445226), we get a palindrome (788989887).

The spelling of 622544661 in words is "six hundred twenty-two million, five hundred forty-four thousand, six hundred sixty-one".