667129211044 has 6 divisors (see below), whose sum is σ = 1167476119334. Its totient is φ = 333564605520.

The previous prime is 667129210991. The next prime is 667129211059. The reversal of 667129211044 is 440112921766.

It can be written as a sum of positive squares in only one way, i.e., 516788454400 + 150340756644 = 718880^2 + 387738^2 .

It is a super-2 number, since 2×667129211044² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83391151377 + ... + 83391151384.

Almost surely, 2^667129211044 is an apocalyptic number.

It is an amenable number.

667129211044 is a deficient number, since it is larger than the sum of its proper divisors (500346908290).

667129211044 is a wasteful number, since it uses less digits than its factorization.

667129211044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166782302765 (or 166782302763 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 667129211044 in words is "six hundred sixty-seven billion, one hundred twenty-nine million, two hundred eleven thousand, forty-four".