661170071166 has 32 divisors (see below), whose sum is σ = 1445765760000. Its totient is φ = 199908334080.

The previous prime is 661170071147. The next prime is 661170071167.

661170071166 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661170071167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11125966 + ... + 11185233.

It is an arithmetic number, because the mean of its divisors is an integer number (45180180000).

Almost surely, 2^661170071166 is an apocalyptic number.

661170071166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

661170071166 is an abundant number, since it is smaller than the sum of its proper divisors (784595688834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661170071166 is a wasteful number, since it uses less digits than its factorization.

661170071166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22311664.

The product of its (nonzero) digits is 63504, while the sum is 42.

It can be divided in two parts, 6611700 and 71166, that added together give a palindrome (6682866).

The spelling of 661170071166 in words is "six hundred sixty-one billion, one hundred seventy million, seventy-one thousand, one hundred sixty-six".