622665621 has 6 divisors (see below), whose sum is σ = 899405910. Its totient is φ = 415110408.

The previous prime is 622665619. The next prime is 622665623. The reversal of 622665621 is 126566226.

622665621 is a `hidden beast` number, since 6 + 2 + 26 + 6 + 5 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (622665619) and next prime (622665623).

It can be written as a sum of positive squares in only one way, i.e., 387656721 + 235008900 = 19689^2 + 15330^2 .

It is not a de Polignac number, because 622665621 - 2¹ = 622665619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622665623) 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, 34592526 + ... + 34592543.

It is an arithmetic number, because the mean of its divisors is an integer number (149900985).

Almost surely, 2^622665621 is an apocalyptic number.

It is an amenable number.

622665621 is a deficient number, since it is larger than the sum of its proper divisors (276740289).

622665621 is a wasteful number, since it uses less digits than its factorization.

622665621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69185075 (or 69185072 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 622665621 is about 24953.2687437939. The cubic root of 622665621 is about 853.9221834735.

It can be divided in two parts, 622665 and 621, that added together give a triangular number (623286 = T₁₁₁₆).

The spelling of 622665621 in words is "six hundred twenty-two million, six hundred sixty-five thousand, six hundred twenty-one".