66501511166 has 16 divisors (see below), whose sum is σ = 105662379744. Its totient is φ = 31282285824.

The previous prime is 66501511123. The next prime is 66501511169. The reversal of 66501511166 is 66111510566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501511169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305615 + ... + 475818.

It is an arithmetic number, because the mean of its divisors is an integer number (6603898734).

Almost surely, 2^66501511166 is an apocalyptic number.

66501511166 is a deficient number, since it is larger than the sum of its proper divisors (39160868578).

66501511166 is a wasteful number, since it uses less digits than its factorization.

66501511166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783955.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 66501511166 in words is "sixty-six billion, five hundred one million, five hundred eleven thousand, one hundred sixty-six".