1665964167 has 8 divisors (see below), whose sum is σ = 2538612096. Its totient is φ = 951979512.

The previous prime is 1665964159. The next prime is 1665964217. The reversal of 1665964167 is 7614695661.

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

It is not a de Polignac number, because 1665964167 - 2³ = 1665964159 is a prime.

It is a super-3 number, since 3×1665964167³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665964667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39665793 + ... + 39665834.

It is an arithmetic number, because the mean of its divisors is an integer number (317326512).

Almost surely, 2^1665964167 is an apocalyptic number.

1665964167 is a deficient number, since it is larger than the sum of its proper divisors (872647929).

1665964167 is an equidigital number, since it uses as much as digits as its factorization.

1665964167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79331637.

The product of its digits is 1632960, while the sum is 51.

The square root of 1665964167 is about 40816.2243109281. The cubic root of 1665964167 is about 1185.4644969959.

The spelling of 1665964167 in words is "one billion, six hundred sixty-five million, nine hundred sixty-four thousand, one hundred sixty-seven".