3666739991 has 2 divisors, whose sum is σ = 3666739992. Its totient is φ = 3666739990.

The previous prime is 3666739943. The next prime is 3666740027. The reversal of 3666739991 is 1999376663.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3666739991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3666739991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3666732991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833369995 + 1833369996.

It is an arithmetic number, because the mean of its divisors is an integer number (1833369996).

Almost surely, 2^3666739991 is an apocalyptic number.

3666739991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666739991 is an equidigital number, since it uses as much as digits as its factorization.

3666739991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 59.

The square root of 3666739991 is about 60553.6125346787. The cubic root of 3666739991 is about 1542.0319485419.

The spelling of 3666739991 in words is "three billion, six hundred sixty-six million, seven hundred thirty-nine thousand, nine hundred ninety-one".