621666471 has 8 divisors (see below), whose sum is σ = 864927360. Its totient is φ = 396424952.

The previous prime is 621666457. The next prime is 621666473. The reversal of 621666471 is 174666126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621666471 - 2⁵ = 621666439 is a prime.

It is a super-3 number, since 3×621666471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621666473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4504761 + ... + 4504898.

It is an arithmetic number, because the mean of its divisors is an integer number (108115920).

Almost surely, 2^621666471 is an apocalyptic number.

621666471 is a deficient number, since it is larger than the sum of its proper divisors (243260889).

621666471 is a wasteful number, since it uses less digits than its factorization.

621666471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009685.

The product of its digits is 72576, while the sum is 39.

The square root of 621666471 is about 24933.2402828032. The cubic root of 621666471 is about 853.4651949584.

It can be divided in two parts, 6216664 and 71, that multiplied together give a palindrome (441383144).

The spelling of 621666471 in words is "six hundred twenty-one million, six hundred sixty-six thousand, four hundred seventy-one".