621945663 has 8 divisors (see below), whose sum is σ = 878041008. Its totient is φ = 390240384.

The previous prime is 621945661. The next prime is 621945671. The reversal of 621945663 is 366549126.

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

It is not a de Polignac number, because 621945663 - 2¹ = 621945661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621945661) 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, 6097456 + ... + 6097557.

It is an arithmetic number, because the mean of its divisors is an integer number (109755126).

Almost surely, 2^621945663 is an apocalyptic number.

621945663 is a deficient number, since it is larger than the sum of its proper divisors (256095345).

621945663 is a wasteful number, since it uses less digits than its factorization.

621945663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195033.

The product of its digits is 233280, while the sum is 42.

The square root of 621945663 is about 24938.8384452845. The cubic root of 621945663 is about 853.5929403031.

The spelling of 621945663 in words is "six hundred twenty-one million, nine hundred forty-five thousand, six hundred sixty-three".