661610118 has 32 divisors (see below), whose sum is σ = 1474149600. Its totient is φ = 196551936.

The previous prime is 661610113. The next prime is 661610149. The reversal of 661610118 is 811016166.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661610113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143983 + ... + 148506.

It is an arithmetic number, because the mean of its divisors is an integer number (46067175).

Almost surely, 2^661610118 is an apocalyptic number.

661610118 is an abundant number, since it is smaller than the sum of its proper divisors (812539482).

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

661610118 is a wasteful number, since it uses less digits than its factorization.

661610118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292536.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 661610118 is about 25721.7829475330. The cubic root of 661610118 is about 871.3662059436.

The spelling of 661610118 in words is "six hundred sixty-one million, six hundred ten thousand, one hundred eighteen".