661126066 has 8 divisors (see below), whose sum is σ = 1015876764. Its totient is φ = 322500480.

The previous prime is 661126043. The next prime is 661126091. The reversal of 661126066 is 660621166.

It can be written as a sum of positive squares in 2 ways, for example, as 652547025 + 8579041 = 25545^2 + 2929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4031175 + ... + 4031338.

Almost surely, 2^661126066 is an apocalyptic number.

661126066 is a deficient number, since it is larger than the sum of its proper divisors (354750698).

661126066 is a wasteful number, since it uses less digits than its factorization.

661126066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062556.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 661126066 is about 25712.3718470311. The cubic root of 661126066 is about 871.1536490069.

The spelling of 661126066 in words is "six hundred sixty-one million, one hundred twenty-six thousand, sixty-six".