6221666155 has 16 divisors (see below), whose sum is σ = 7723846368. Its totient is φ = 4807840000.

The previous prime is 6221666149. The next prime is 6221666197. The reversal of 6221666155 is 5516661226.

It is not a de Polignac number, because 6221666155 - 2⁵ = 6221666123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129541 + ... + 170950.

It is an arithmetic number, because the mean of its divisors is an integer number (482740398).

Almost surely, 2^6221666155 is an apocalyptic number.

6221666155 is a deficient number, since it is larger than the sum of its proper divisors (1502180213).

6221666155 is a wasteful number, since it uses less digits than its factorization.

6221666155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300638.

The product of its digits is 129600, while the sum is 40.

The square root of 6221666155 is about 78877.5389765680. The cubic root of 6221666155 is about 1839.2279916467.

The spelling of 6221666155 in words is "six billion, two hundred twenty-one million, six hundred sixty-six thousand, one hundred fifty-five".