665053111 has 4 divisors (see below), whose sum is σ = 667836000. Its totient is φ = 662270224.

The previous prime is 665053091. The next prime is 665053139. The reversal of 665053111 is 111350566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111350566 = 2 ⋅55675283.

It is a cyclic number.

It is not a de Polignac number, because 665053111 - 2¹¹ = 665051063 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 665053111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665053511) 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, 1391086 + ... + 1391563.

It is an arithmetic number, because the mean of its divisors is an integer number (166959000).

Almost surely, 2^665053111 is an apocalyptic number.

665053111 is a deficient number, since it is larger than the sum of its proper divisors (2782889).

665053111 is a wasteful number, since it uses less digits than its factorization.

665053111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782888.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 665053111 is about 25788.6236740156. The cubic root of 665053111 is about 872.8751100107.

The spelling of 665053111 in words is "six hundred sixty-five million, fifty-three thousand, one hundred eleven".