1666216171167 has 16 divisors (see below), whose sum is σ = 2415881001312. Its totient is φ = 1017213050880.

The previous prime is 1666216171111. The next prime is 1666216171171. The reversal of 1666216171167 is 7611716126661.

It is not a de Polignac number, because 1666216171167 - 2¹⁸ = 1666215909023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666216171267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441496834 + ... + 441500607.

It is an arithmetic number, because the mean of its divisors is an integer number (150992562582).

Almost surely, 2^{1666216171167} is an apocalyptic number.

1666216171167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1666216171167 is a deficient number, since it is larger than the sum of its proper divisors (749664830145).

1666216171167 is a wasteful number, since it uses less digits than its factorization.

1666216171167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882997498.

The product of its digits is 762048, while the sum is 51.

The spelling of 1666216171167 in words is "one trillion, six hundred sixty-six billion, two hundred sixteen million, one hundred seventy-one thousand, one hundred sixty-seven".