1661166164 has 24 divisors (see below), whose sum is σ = 3323631360. Its totient is φ = 711650016.

The previous prime is 1661166151. The next prime is 1661166281. The reversal of 1661166164 is 4616611661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71822 + ... + 92090.

It is an arithmetic number, because the mean of its divisors is an integer number (138484640).

Almost surely, 2^1661166164 is an apocalyptic number.

1661166164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1661166164 is an abundant number, since it is smaller than the sum of its proper divisors (1662465196).

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

1661166164 is a wasteful number, since it uses less digits than its factorization.

1661166164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23207 (or 23205 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 1661166164 is about 40757.4062472086. The cubic root of 1661166164 is about 1184.3253505771.

The spelling of 1661166164 in words is "one billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred sixty-four".