4001666077 has 2 divisors, whose sum is σ = 4001666078. Its totient is φ = 4001666076.

The previous prime is 4001666047. The next prime is 4001666089. The reversal of 4001666077 is 7706661004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3935178361 + 66487716 = 62731^2 + 8154^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001666077 - 2¹⁹ = 4001141789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001666047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000833038 + 2000833039.

It is an arithmetic number, because the mean of its divisors is an integer number (2000833039).

Almost surely, 2^4001666077 is an apocalyptic number.

It is an amenable number.

4001666077 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001666077 is an equidigital number, since it uses as much as digits as its factorization.

4001666077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 4001666077 is about 63258.7233273009. The cubic root of 4001666077 is about 1587.6214157410.

The spelling of 4001666077 in words is "four billion, one million, six hundred sixty-six thousand, seventy-seven".