661105166066 has 8 divisors (see below), whose sum is σ = 991843087104. Its totient is φ = 330490803700.

The previous prime is 661105166053. The next prime is 661105166081. The reversal of 661105166066 is 660661501166.

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

It is a Curzon number.

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, 30876290 + ... + 30897693.

It is an arithmetic number, because the mean of its divisors is an integer number (123980385888).

Almost surely, 2^661105166066 is an apocalyptic number.

661105166066 is a deficient number, since it is larger than the sum of its proper divisors (330737921038).

661105166066 is a wasteful number, since it uses less digits than its factorization.

661105166066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61779336.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 661105166066 in words is "six hundred sixty-one billion, one hundred five million, one hundred sixty-six thousand, sixty-six".