2666663654165 has 32 divisors (see below), whose sum is σ = 3671621291520. Its totient is φ = 1821331378944.

The previous prime is 2666663654159. The next prime is 2666663654167. The reversal of 2666663654165 is 5614563666662.

It is not a de Polignac number, because 2666663654165 - 2¹⁸ = 2666663392021 is a prime.

It is a super-2 number, since 2×2666663654165² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2666663654098 and 2666663654107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666663654167) 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 31 ways as a sum of consecutive naturals, for example, 41610527 + ... + 41674563.

It is an arithmetic number, because the mean of its divisors is an integer number (114738165360).

Almost surely, 2^{2666663654165} is an apocalyptic number.

It is an amenable number.

2666663654165 is a deficient number, since it is larger than the sum of its proper divisors (1004957637355).

2666663654165 is a wasteful number, since it uses less digits than its factorization.

2666663654165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68741.

The product of its digits is 167961600, while the sum is 62.

The spelling of 2666663654165 in words is "two trillion, six hundred sixty-six billion, six hundred sixty-three million, six hundred fifty-four thousand, one hundred sixty-five".