6666667784445 has 16 divisors (see below), whose sum is σ = 10666724647680. Its totient is φ = 3555537420864.

The previous prime is 6666667784419. The next prime is 6666667784459. The reversal of 6666667784445 is 5444877666666.

It is not a de Polignac number, because 6666667784445 - 2¹² = 6666667780349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2059011 + ... + 4191999.

It is an arithmetic number, because the mean of its divisors is an integer number (666670290480).

Almost surely, 2^{6666667784445} is an apocalyptic number.

It is an amenable number.

6666667784445 is a deficient number, since it is larger than the sum of its proper divisors (4000056863235).

6666667784445 is a wasteful number, since it uses less digits than its factorization.

6666667784445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341364.

The product of its digits is 5852528640, while the sum is 75.

The spelling of 6666667784445 in words is "six trillion, six hundred sixty-six billion, six hundred sixty-seven million, seven hundred eighty-four thousand, four hundred forty-five".