661057750166 has 16 divisors (see below), whose sum is σ = 1081840475088. Its totient is φ = 300450348000.

The previous prime is 661057750147. The next prime is 661057750169.

661057750166 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661057750169) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1299605 + ... + 1735248.

It is an arithmetic number, because the mean of its divisors is an integer number (67615029693).

Almost surely, 2^661057750166 is an apocalyptic number.

661057750166 is a deficient number, since it is larger than the sum of its proper divisors (420782724922).

661057750166 is a wasteful number, since it uses less digits than its factorization.

661057750166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044767.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 661057750166 in words is "six hundred sixty-one billion, fifty-seven million, seven hundred fifty thousand, one hundred sixty-six".