1665168979 has 4 divisors (see below), whose sum is σ = 1710173584. Its totient is φ = 1620164376.

The previous prime is 1665168971. The next prime is 1665169001. The reversal of 1665168979 is 9798615661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665168979 - 2³ = 1665168971 is a prime.

It is a super-3 number, since 3×1665168979³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665168971) 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, 22502247 + ... + 22502320.

It is an arithmetic number, because the mean of its divisors is an integer number (427543396).

Almost surely, 2^1665168979 is an apocalyptic number.

1665168979 is a deficient number, since it is larger than the sum of its proper divisors (45004605).

1665168979 is an equidigital number, since it uses as much as digits as its factorization.

1665168979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45004604.

The product of its digits is 4898880, while the sum is 58.

The square root of 1665168979 is about 40806.4820708671. The cubic root of 1665168979 is about 1185.2758540499.

The spelling of 1665168979 in words is "one billion, six hundred sixty-five million, one hundred sixty-eight thousand, nine hundred seventy-nine".