665133082021 has 16 divisors (see below), whose sum is σ = 704917805760. Its totient is φ = 625421950720.

The previous prime is 665133081983. The next prime is 665133082027. The reversal of 665133082021 is 120280331566.

665133082021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 665133082021 - 2¹⁵ = 665133049253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665133082027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146277270 + ... + 146281816.

It is an arithmetic number, because the mean of its divisors is an integer number (44057362860).

Almost surely, 2^665133082021 is an apocalyptic number.

It is an amenable number.

665133082021 is a deficient number, since it is larger than the sum of its proper divisors (39784723739).

665133082021 is a wasteful number, since it uses less digits than its factorization.

665133082021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10724.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 665133082021 in words is "six hundred sixty-five billion, one hundred thirty-three million, eighty-two thousand, twenty-one".