661417116 has 24 divisors (see below), whose sum is σ = 1593091584. Its totient is φ = 213360240.

The previous prime is 661417103. The next prime is 661417121. The reversal of 661417116 is 611714166.

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, 888630 + ... + 889373.

It is an arithmetic number, because the mean of its divisors is an integer number (66378816).

Almost surely, 2^661417116 is an apocalyptic number.

It is an amenable number.

661417116 is an abundant number, since it is smaller than the sum of its proper divisors (931674468).

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

661417116 is a wasteful number, since it uses less digits than its factorization.

661417116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778041 (or 1778039 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 661417116 is about 25718.0309510662. The cubic root of 661417116 is about 871.2814673281.

The spelling of 661417116 in words is "six hundred sixty-one million, four hundred seventeen thousand, one hundred sixteen".