665666650652 has 6 divisors (see below), whose sum is σ = 1164916638648. Its totient is φ = 332833325324.

The previous prime is 665666650637. The next prime is 665666650667. The reversal of 665666650652 is 256056666566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665666650637) and next prime (665666650667).

It is a super-2 number, since 2×665666650652² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665666650591 and 665666650600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83208331328 + ... + 83208331335.

It is an arithmetic number, because the mean of its divisors is an integer number (194152773108).

Almost surely, 2^665666650652 is an apocalyptic number.

It is an amenable number.

665666650652 is a deficient number, since it is larger than the sum of its proper divisors (499249987996).

665666650652 is a wasteful number, since it uses less digits than its factorization.

665666650652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166416662667 (or 166416662665 counting only the distinct ones).

The product of its (nonzero) digits is 69984000, while the sum is 59.

The spelling of 665666650652 in words is "six hundred sixty-five billion, six hundred sixty-six million, six hundred fifty thousand, six hundred fifty-two".