6621643442 has 8 divisors (see below), whose sum is σ = 9946281600. Its totient is φ = 3306216244.

The previous prime is 6621643439. The next prime is 6621643451. The reversal of 6621643442 is 2443461266.

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

It is a junction number, because it is equal to n+sod(n) for n = 6621643396 and 6621643405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2300942 + ... + 2303817.

It is an arithmetic number, because the mean of its divisors is an integer number (1243285200).

Almost surely, 2^6621643442 is an apocalyptic number.

6621643442 is a deficient number, since it is larger than the sum of its proper divisors (3324638158).

6621643442 is a wasteful number, since it uses less digits than its factorization.

6621643442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605480.

The product of its digits is 165888, while the sum is 38.

The square root of 6621643442 is about 81373.4811962718. The cubic root of 6621643442 is about 1877.8256363329.

The spelling of 6621643442 in words is "six billion, six hundred twenty-one million, six hundred forty-three thousand, four hundred forty-two".