661101166 has 12 divisors (see below), whose sum is σ = 1089997776. Its totient is φ = 300500420.

The previous prime is 661101149. The next prime is 661101169.

661101166 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 (661101169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1365670 + ... + 1366153.

It is an arithmetic number, because the mean of its divisors is an integer number (90833148).

Almost surely, 2^661101166 is an apocalyptic number.

661101166 is a deficient number, since it is larger than the sum of its proper divisors (428896610).

661101166 is a wasteful number, since it uses less digits than its factorization.

661101166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731847 (or 2731836 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 661101166 is about 25711.8876397669. The cubic root of 661101166 is about 871.1427121123.

It can be divided in two parts, 66110 and 1166, that added together give a palindrome (67276).

The spelling of 661101166 in words is "six hundred sixty-one million, one hundred one thousand, one hundred sixty-six".