1667986167 has 4 divisors (see below), whose sum is σ = 2223981560. Its totient is φ = 1111990776.

The previous prime is 1667986157. The next prime is 1667986169. The reversal of 1667986167 is 7616897661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7616897661 = 3 ⋅2538965887.

It is not a de Polignac number, because 1667986167 - 2⁸ = 1667985911 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 (1667986169) 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, 277997692 + ... + 277997697.

It is an arithmetic number, because the mean of its divisors is an integer number (555995390).

Almost surely, 2^1667986167 is an apocalyptic number.

1667986167 is a deficient number, since it is larger than the sum of its proper divisors (555995393).

1667986167 is an equidigital number, since it uses as much as digits as its factorization.

1667986167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555995392.

The product of its digits is 4572288, while the sum is 57.

The square root of 1667986167 is about 40840.9863617420. The cubic root of 1667986167 is about 1185.9439070885.

The spelling of 1667986167 in words is "one billion, six hundred sixty-seven million, nine hundred eighty-six thousand, one hundred sixty-seven".