1665013442 has 4 divisors (see below), whose sum is σ = 2497520166. Its totient is φ = 832506720.

The previous prime is 1665013421. The next prime is 1665013481. The reversal of 1665013442 is 2443105661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2443105661 = 7669 ⋅318569.

It can be written as a sum of positive squares in only one way, i.e., 1615155721 + 49857721 = 40189^2 + 7061^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1665013399 and 1665013408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416253359 + ... + 416253362.

Almost surely, 2^1665013442 is an apocalyptic number.

1665013442 is a deficient number, since it is larger than the sum of its proper divisors (832506724).

1665013442 is an equidigital number, since it uses as much as digits as its factorization.

1665013442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832506723.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1665013442 is about 40804.5762384564. The cubic root of 1665013442 is about 1185.2389488883.

The spelling of 1665013442 in words is "one billion, six hundred sixty-five million, thirteen thousand, four hundred forty-two".