43666676767949 has 2 divisors, whose sum is σ = 43666676767950. Its totient is φ = 43666676767948.

The previous prime is 43666676767943. The next prime is 43666676767957. The reversal of 43666676767949 is 94976767666634.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28360076874724 + 15306599893225 = 5325418^2 + 3912365^2 .

It is a cyclic number.

It is not a de Polignac number, because 43666676767949 - 2⁴⁰ = 42567165140173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43666676767943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21833338383974 + 21833338383975.

It is an arithmetic number, because the mean of its divisors is an integer number (21833338383975).

Almost surely, 2^{43666676767949} is an apocalyptic number.

It is an amenable number.

43666676767949 is a deficient number, since it is larger than the sum of its proper divisors (1).

43666676767949 is an equidigital number, since it uses as much as digits as its factorization.

43666676767949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62219695104, while the sum is 86.

The spelling of 43666676767949 in words is "forty-three trillion, six hundred sixty-six billion, six hundred seventy-six million, seven hundred sixty-seven thousand, nine hundred forty-nine".