1666667595939 has 8 divisors (see below), whose sum is σ = 2259888265920. Its totient is φ = 1092279328296.

The previous prime is 1666667595893. The next prime is 1666667595941. The reversal of 1666667595939 is 9395957666661.

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

It is not a de Polignac number, because 1666667595939 - 2¹³ = 1666667587747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666667595239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4708100377 + ... + 4708100730.

It is an arithmetic number, because the mean of its divisors is an integer number (282486033240).

Almost surely, 2^{1666667595939} is an apocalyptic number.

1666667595939 is a deficient number, since it is larger than the sum of its proper divisors (593220669981).

1666667595939 is an equidigital number, since it uses as much as digits as its factorization.

1666667595939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9416201169.

The product of its digits is 2976069600, while the sum is 78.

The spelling of 1666667595939 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-seven million, five hundred ninety-five thousand, nine hundred thirty-nine".