421641663 has 8 divisors (see below), whose sum is σ = 575900976. Its totient is φ = 274238400.

The previous prime is 421641613. The next prime is 421641707. The reversal of 421641663 is 366146124.

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

It is not a de Polignac number, because 421641663 - 2²⁰ = 420593087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421641613) 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, 1713868 + ... + 1714113.

It is an arithmetic number, because the mean of its divisors is an integer number (71987622).

Almost surely, 2^421641663 is an apocalyptic number.

421641663 is a deficient number, since it is larger than the sum of its proper divisors (154259313).

421641663 is a wasteful number, since it uses less digits than its factorization.

421641663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428025.

The product of its digits is 20736, while the sum is 33.

The square root of 421641663 is about 20533.9149457672. The cubic root of 421641663 is about 749.8617007215.

Adding to 421641663 its reverse (366146124), we get a palindrome (787787787).

The spelling of 421641663 in words is "four hundred twenty-one million, six hundred forty-one thousand, six hundred sixty-three".