1666670366867 has 16 divisors (see below), whose sum is σ = 1913932108800. Its totient is φ = 1435370689440.

The previous prime is 1666670366861. The next prime is 1666670366909. The reversal of 1666670366867 is 7686630766661.

It is not a de Polignac number, because 1666670366867 - 2⁸ = 1666670366611 is a prime.

It is a super-2 number, since 2×1666670366867² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666670366797 and 1666670366806.

It is not an unprimeable number, because it can be changed into a prime (1666670366861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9651518 + ... + 9822684.

It is an arithmetic number, because the mean of its divisors is an integer number (119620756800).

Almost surely, 2^{1666670366867} is an apocalyptic number.

1666670366867 is a deficient number, since it is larger than the sum of its proper divisors (247261741933).

1666670366867 is a wasteful number, since it uses less digits than its factorization.

1666670366867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217786.

The product of its (nonzero) digits is 329204736, while the sum is 68.

The spelling of 1666670366867 in words is "one trillion, six hundred sixty-six billion, six hundred seventy million, three hundred sixty-six thousand, eight hundred sixty-seven".