661795118 has 16 divisors (see below), whose sum is σ = 1059661440. Its totient is φ = 309065400.

The previous prime is 661795103. The next prime is 661795139. The reversal of 661795118 is 811597166.

661795118 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 119948 + ... + 125343.

It is an arithmetic number, because the mean of its divisors is an integer number (66228840).

Almost surely, 2^661795118 is an apocalyptic number.

661795118 is a deficient number, since it is larger than the sum of its proper divisors (397866322).

661795118 is a wasteful number, since it uses less digits than its factorization.

661795118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245383.

The product of its digits is 90720, while the sum is 44.

The square root of 661795118 is about 25725.3788699020. The cubic root of 661795118 is about 871.4474157684.

The spelling of 661795118 in words is "six hundred sixty-one million, seven hundred ninety-five thousand, one hundred eighteen".