1665409224979 has 4 divisors (see below), whose sum is σ = 1666472027584. Its totient is φ = 1664346422376.

The previous prime is 1665409224971. The next prime is 1665409224991. The reversal of 1665409224979 is 9794229045661.

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 1665409224979 - 2³ = 1665409224971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665409224979.

It is not an unprimeable number, because it can be changed into a prime (1665409224971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531398952 + ... + 531402085.

It is an arithmetic number, because the mean of its divisors is an integer number (416618006896).

Almost surely, 2^{1665409224979} is an apocalyptic number.

1665409224979 is a deficient number, since it is larger than the sum of its proper divisors (1062802605).

1665409224979 is a wasteful number, since it uses less digits than its factorization.

1665409224979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062802604.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 1665409224979 in words is "one trillion, six hundred sixty-five billion, four hundred nine million, two hundred twenty-four thousand, nine hundred seventy-nine".