1966543167 has 4 divisors (see below), whose sum is σ = 2622057560. Its totient is φ = 1311028776.

The previous prime is 1966543141. The next prime is 1966543169. The reversal of 1966543167 is 7613456691.

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

It is not a de Polignac number, because 1966543167 - 2⁷ = 1966543039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966543169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327757192 + ... + 327757197.

It is an arithmetic number, because the mean of its divisors is an integer number (655514390).

Almost surely, 2^1966543167 is an apocalyptic number.

1966543167 is a deficient number, since it is larger than the sum of its proper divisors (655514393).

1966543167 is an equidigital number, since it uses as much as digits as its factorization.

1966543167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655514392.

The product of its digits is 816480, while the sum is 48.

The square root of 1966543167 is about 44345.7232097978. The cubic root of 1966543167 is about 1252.8560118804.

The spelling of 1966543167 in words is "one billion, nine hundred sixty-six million, five hundred forty-three thousand, one hundred sixty-seven".