661202166 has 16 divisors (see below), whose sum is σ = 1392004800. Its totient is φ = 208800648.

The previous prime is 661202161. The next prime is 661202177.

661202166 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 (661202161) 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, 2899896 + ... + 2900123.

It is an arithmetic number, because the mean of its divisors is an integer number (87000300).

Almost surely, 2^661202166 is an apocalyptic number.

661202166 is an abundant number, since it is smaller than the sum of its proper divisors (730802634).

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

661202166 is a wasteful number, since it uses less digits than its factorization.

661202166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800043.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 661202166 is about 25713.8516368124. The cubic root of 661202166 is about 871.1870729142.

It can be divided in two parts, 66120 and 2166, that added together give a palindrome (68286).

The spelling of 661202166 in words is "six hundred sixty-one million, two hundred two thousand, one hundred sixty-six".