665666003126 has 4 divisors (see below), whose sum is σ = 998499004692. Its totient is φ = 332833001562.

The previous prime is 665666003117. The next prime is 665666003147. The reversal of 665666003126 is 621300666566.

665666003126 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×665666003126² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166416500780 + ... + 166416500783.

It is an arithmetic number, because the mean of its divisors is an integer number (249624751173).

Almost surely, 2^665666003126 is an apocalyptic number.

665666003126 is a deficient number, since it is larger than the sum of its proper divisors (332833001566).

665666003126 is a wasteful number, since it uses less digits than its factorization.

665666003126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332833001565.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 665666003126 in words is "six hundred sixty-five billion, six hundred sixty-six million, three thousand, one hundred twenty-six".