6667783945 has 8 divisors (see below), whose sum is σ = 8472007944. Its totient is φ = 5020449024.

The previous prime is 6667783937. The next prime is 6667783987. The reversal of 6667783945 is 5493877666.

It can be written as a sum of positive squares in 4 ways, for example, as 137851081 + 6529932864 = 11741^2 + 80808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6667783945 - 2³ = 6667783937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39222174 + ... + 39222343.

It is an arithmetic number, because the mean of its divisors is an integer number (1059000993).

Almost surely, 2^6667783945 is an apocalyptic number.

It is an amenable number.

6667783945 is a deficient number, since it is larger than the sum of its proper divisors (1804223999).

6667783945 is a wasteful number, since it uses less digits than its factorization.

6667783945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78444539.

The product of its digits is 45722880, while the sum is 61.

The square root of 6667783945 is about 81656.4997106783. The cubic root of 6667783945 is about 1882.1771918057.

The spelling of 6667783945 in words is "six billion, six hundred sixty-seven million, seven hundred eighty-three thousand, nine hundred forty-five".