801643643 has 4 divisors (see below), whose sum is σ = 803495448. Its totient is φ = 799791840.

The previous prime is 801643597. The next prime is 801643651. The reversal of 801643643 is 346346108.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 801643643 - 2¹⁴ = 801627259 is a prime.

It is a super-2 number, since 2×801643643² = 1285265060724622898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801643693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925253 + ... + 926118.

It is an arithmetic number, because the mean of its divisors is an integer number (200873862).

Almost surely, 2^801643643 is an apocalyptic number.

801643643 is a deficient number, since it is larger than the sum of its proper divisors (1851805).

801643643 is a wasteful number, since it uses less digits than its factorization.

801643643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851804.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 801643643 is about 28313.3121163879. The cubic root of 801643643 is about 928.9530914010.

The spelling of 801643643 in words is "eight hundred one million, six hundred forty-three thousand, six hundred forty-three".