665364533 has 4 divisors (see below), whose sum is σ = 669446688. Its totient is φ = 661282380.

The previous prime is 665364529. The next prime is 665364551. The reversal of 665364533 is 335463566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 335463566 = 2 ⋅167731783.

It is a cyclic number.

It is not a de Polignac number, because 665364533 - 2² = 665364529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665364503) 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, 2040833 + ... + 2041158.

It is an arithmetic number, because the mean of its divisors is an integer number (167361672).

Almost surely, 2^665364533 is an apocalyptic number.

It is an amenable number.

665364533 is a deficient number, since it is larger than the sum of its proper divisors (4082155).

665364533 is a wasteful number, since it uses less digits than its factorization.

665364533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082154.

The product of its digits is 583200, while the sum is 41.

The square root of 665364533 is about 25794.6609398147. The cubic root of 665364533 is about 873.0113347668.

The spelling of 665364533 in words is "six hundred sixty-five million, three hundred sixty-four thousand, five hundred thirty-three".