621663417 has 20 divisors (see below), whose sum is σ = 929690916. Its totient is φ = 413981280.

The previous prime is 621663409. The next prime is 621663437. The reversal of 621663417 is 714366126.

It is a happy number.

621663417 is a `hidden beast` number, since 6 + 2 + 1 + 6 + 634 + 17 = 666.

621663417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 489781161 + 131882256 = 22131^2 + 11484^2 .

It is not a de Polignac number, because 621663417 - 2³ = 621663409 is a prime.

It is a super-2 number, since 2×621663417² = 772930808072231778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (621663437) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 78943 + ... + 86459.

Almost surely, 2^621663417 is an apocalyptic number.

It is an amenable number.

621663417 is a deficient number, since it is larger than the sum of its proper divisors (308027499).

621663417 is a wasteful number, since it uses less digits than its factorization.

621663417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8550 (or 8541 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 621663417 is about 24933.1790391839. The cubic root of 621663417 is about 853.4637973778.

The spelling of 621663417 in words is "six hundred twenty-one million, six hundred sixty-three thousand, four hundred seventeen".