2166678123771 has 8 divisors (see below), whose sum is σ = 3301604760064. Its totient is φ = 1238101785000.

The previous prime is 2166678123769. The next prime is 2166678123773. The reversal of 2166678123771 is 1773218766612.

It is an interprime number because it is at equal distance from previous prime (2166678123769) and next prime (2166678123773).

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

It is not a de Polignac number, because 2166678123771 - 2¹ = 2166678123769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166678123773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51587574355 + ... + 51587574396.

It is an arithmetic number, because the mean of its divisors is an integer number (412700595008).

Almost surely, 2^{2166678123771} is an apocalyptic number.

2166678123771 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2166678123771 is a deficient number, since it is larger than the sum of its proper divisors (1134926636293).

2166678123771 is a wasteful number, since it uses less digits than its factorization.

2166678123771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103175148761.

The product of its digits is 7112448, while the sum is 57.

It can be divided in two parts, 216667 and 8123771, that added together give a palindrome (8340438).

The spelling of 2166678123771 in words is "two trillion, one hundred sixty-six billion, six hundred seventy-eight million, one hundred twenty-three thousand, seven hundred seventy-one".