661099122 has 12 divisors (see below), whose sum is σ = 1432381470. Its totient is φ = 220366368.

The previous prime is 661099121. The next prime is 661099141. The reversal of 661099122 is 221990166.

It can be written as a sum of positive squares in only one way, i.e., 611523441 + 49575681 = 24729^2 + 7041^2 .

It is not an unprimeable number, because it can be changed into a prime (661099121) 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, 18363847 + ... + 18363882.

Almost surely, 2^661099122 is an apocalyptic number.

661099122 is an abundant number, since it is smaller than the sum of its proper divisors (771282348).

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

661099122 is a wasteful number, since it uses less digits than its factorization.

661099122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36727737 (or 36727734 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 661099122 is about 25711.8478915849. The cubic root of 661099122 is about 871.1418143084.

The spelling of 661099122 in words is "six hundred sixty-one million, ninety-nine thousand, one hundred twenty-two".