6666737340671 has 4 divisors (see below), whose sum is σ = 6687768058152. Its totient is φ = 6645706623192.

The previous prime is 6666737340667. The next prime is 6666737340821. The reversal of 6666737340671 is 1760437376666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6666737340671 - 2² = 6666737340667 is a prime.

It is a super-2 number, since 2×6666737340671² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666737340631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10515358265 + ... + 10515358898.

It is an arithmetic number, because the mean of its divisors is an integer number (1671942014538).

Almost surely, 2^{6666737340671} is an apocalyptic number.

6666737340671 is a deficient number, since it is larger than the sum of its proper divisors (21030717481).

6666737340671 is a wasteful number, since it uses less digits than its factorization.

6666737340671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21030717480.

The product of its (nonzero) digits is 96018048, while the sum is 62.

The spelling of 6666737340671 in words is "six trillion, six hundred sixty-six billion, seven hundred thirty-seven million, three hundred forty thousand, six hundred seventy-one".