6662221081 has 2 divisors, whose sum is σ = 6662221082. Its totient is φ = 6662221080.

The previous prime is 6662221063. The next prime is 6662221099. The reversal of 6662221081 is 1801222666.

It is a balanced prime because it is at equal distance from previous prime (6662221063) and next prime (6662221099).

It can be written as a sum of positive squares in only one way, i.e., 5748065856 + 914155225 = 75816^2 + 30235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662221081 - 2⁹ = 6662220569 is a prime.

It is a super-2 number, since 2×6662221081² = 88770379464241617122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6662221021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331110540 + 3331110541.

It is an arithmetic number, because the mean of its divisors is an integer number (3331110541).

Almost surely, 2^6662221081 is an apocalyptic number.

It is an amenable number.

6662221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662221081 is an equidigital number, since it uses as much as digits as its factorization.

6662221081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 6662221081 is about 81622.4300116089. The cubic root of 6662221081 is about 1881.6536191098.

The spelling of 6662221081 in words is "six billion, six hundred sixty-two million, two hundred twenty-one thousand, eighty-one".