661160216 has 8 divisors (see below), whose sum is σ = 1239675420. Its totient is φ = 330580104.

The previous prime is 661160189. The next prime is 661160237. The reversal of 661160216 is 612061166.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41322506 + ... + 41322521.

Almost surely, 2^661160216 is an apocalyptic number.

It is an amenable number.

661160216 is a deficient number, since it is larger than the sum of its proper divisors (578515204).

661160216 is a wasteful number, since it uses less digits than its factorization.

661160216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82645033 (or 82645029 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 661160216 is about 25713.0359156596. The cubic root of 661160216 is about 871.1686483574.

The spelling of 661160216 in words is "six hundred sixty-one million, one hundred sixty thousand, two hundred sixteen".