666061560166 has 4 divisors (see below), whose sum is σ = 999092340252. Its totient is φ = 333030780082.

The previous prime is 666061560071. The next prime is 666061560169. The reversal of 666061560166 is 661065160666.

666061560166 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, and also an emirpimes, since its reverse is a distinct semiprime: 661065160666 = 2 ⋅330532580333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666061560169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166515390040 + ... + 166515390043.

It is an arithmetic number, because the mean of its divisors is an integer number (249773085063).

Almost surely, 2^666061560166 is an apocalyptic number.

666061560166 is a deficient number, since it is larger than the sum of its proper divisors (333030780086).

666061560166 is a wasteful number, since it uses less digits than its factorization.

666061560166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333030780085.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 666061560166 in words is "six hundred sixty-six billion, sixty-one million, five hundred sixty thousand, one hundred sixty-six".