2666666666657 has 4 divisors (see below), whose sum is σ = 3047619047616. Its totient is φ = 2285714285700.

The previous prime is 2666666666639. The next prime is 2666666666693. The reversal of 2666666666657 is 7566666666662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2666666666657 - 2²⁴ = 2666649889441 is a prime.

It is a super-2 number, since 2×2666666666657² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666666666557) 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, 190476190469 + ... + 190476190482.

It is an arithmetic number, because the mean of its divisors is an integer number (761904761904).

Almost surely, 2^{2666666666657} is an apocalyptic number.

It is an amenable number.

2666666666657 is a deficient number, since it is larger than the sum of its proper divisors (380952380959).

2666666666657 is an equidigital number, since it uses as much as digits as its factorization.

2666666666657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380952380958.

The product of its digits is 4232632320, while the sum is 74.

The spelling of 2666666666657 in words is "two trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-seven".