6600021943 has 4 divisors (see below), whose sum is σ = 6605073000. Its totient is φ = 6594970888.

The previous prime is 6600021929. The next prime is 6600021947. The reversal of 6600021943 is 3491200066.

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 6600021943 - 2²⁵ = 6566467511 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 (6600021947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2523568 + ... + 2526181.

It is an arithmetic number, because the mean of its divisors is an integer number (1651268250).

Almost surely, 2^6600021943 is an apocalyptic number.

6600021943 is a deficient number, since it is larger than the sum of its proper divisors (5051057).

6600021943 is a wasteful number, since it uses less digits than its factorization.

6600021943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051056.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 6600021943 is about 81240.5190960767. The cubic root of 6600021943 is about 1875.7795341618.

The spelling of 6600021943 in words is "six billion, six hundred million, twenty-one thousand, nine hundred forty-three".