8405642663 has 8 divisors (see below), whose sum is σ = 9485992080. Its totient is φ = 7377993280.

The previous prime is 8405642657. The next prime is 8405642669. The reversal of 8405642663 is 3662465048.

It is an interprime number because it is at equal distance from previous prime (8405642657) and next prime (8405642669).

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 8405642663 - 2⁶ = 8405642599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8405642669) 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, 13174670 + ... + 13175307.

It is an arithmetic number, because the mean of its divisors is an integer number (1185749010).

Almost surely, 2^8405642663 is an apocalyptic number.

8405642663 is a deficient number, since it is larger than the sum of its proper divisors (1080349417).

8405642663 is a wasteful number, since it uses less digits than its factorization.

8405642663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26350017.

The product of its (nonzero) digits is 829440, while the sum is 44.

The square root of 8405642663 is about 91682.2919816035. The cubic root of 8405642663 is about 2033.2477849313.

The spelling of 8405642663 in words is "eight billion, four hundred five million, six hundred forty-two thousand, six hundred sixty-three".