3666172709 has 2 divisors, whose sum is σ = 3666172710. Its totient is φ = 3666172708.

The previous prime is 3666172693. The next prime is 3666172717. The reversal of 3666172709 is 9072716663.

It is a happy number.

3666172709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3237268609 + 428904100 = 56897^2 + 20710^2 .

It is an emirp because it is prime and its reverse (9072716663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3666172709 - 2⁴ = 3666172693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3666172789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833086354 + 1833086355.

It is an arithmetic number, because the mean of its divisors is an integer number (1833086355).

Almost surely, 2^3666172709 is an apocalyptic number.

It is an amenable number.

3666172709 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666172709 is an equidigital number, since it uses as much as digits as its factorization.

3666172709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 3666172709 is about 60548.9282233798. The cubic root of 3666172709 is about 1541.9524217610.

The spelling of 3666172709 in words is "three billion, six hundred sixty-six million, one hundred seventy-two thousand, seven hundred nine".