661099092 has 12 divisors (see below), whose sum is σ = 1542564576. Its totient is φ = 220366360.

The previous prime is 661099057. The next prime is 661099093. The reversal of 661099092 is 290990166.

It is a happy number.

661099092 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661099093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27545784 + ... + 27545807.

It is an arithmetic number, because the mean of its divisors is an integer number (128547048).

Almost surely, 2^661099092 is an apocalyptic number.

It is an amenable number.

661099092 is an abundant number, since it is smaller than the sum of its proper divisors (881465484).

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

661099092 is a wasteful number, since it uses less digits than its factorization.

661099092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55091598 (or 55091596 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 661099092 is about 25711.8473081963. The cubic root of 661099092 is about 871.1418011313.

The spelling of 661099092 in words is "six hundred sixty-one million, ninety-nine thousand, ninety-two".