6158668221 has 10 divisors (see below), whose sum is σ = 9199985982. Its totient is φ = 4105778760.

The previous prime is 6158668193. The next prime is 6158668237. The reversal of 6158668221 is 1228668516.

6158668221 is a `hidden beast` number, since 6 + 1 + 586 + 68 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3134768121 + 3023900100 = 55989^2 + 54990^2 .

It is not a de Polignac number, because 6158668221 - 2¹³ = 6158660029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6158668291) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 38016390 + ... + 38016551.

Almost surely, 2^6158668221 is an apocalyptic number.

It is an amenable number.

6158668221 is a deficient number, since it is larger than the sum of its proper divisors (3041317761).

6158668221 is an equidigital number, since it uses as much as digits as its factorization.

6158668221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76032953 (or 76032944 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 6158668221 is about 78477.1828049402. The cubic root of 6158668221 is about 1832.9991749724. Note that the first 3 decimals are identical.

The spelling of 6158668221 in words is "six billion, one hundred fifty-eight million, six hundred sixty-eight thousand, two hundred twenty-one".