660687774 has 8 divisors (see below), whose sum is σ = 1321375560. Its totient is φ = 220229256.

The previous prime is 660687757. The next prime is 660687787. The reversal of 660687774 is 477786066.

It is a sphenic number, since it is the product of 3 distinct primes.

660687774 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55057309 + ... + 55057320.

It is an arithmetic number, because the mean of its divisors is an integer number (165171945).

Almost surely, 2^660687774 is an apocalyptic number.

660687774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

660687774 is a wasteful number, since it uses less digits than its factorization.

660687774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110114634.

The product of its (nonzero) digits is 2370816, while the sum is 51.

The square root of 660687774 is about 25703.8474551963. The cubic root of 660687774 is about 870.9610966827.

The spelling of 660687774 in words is "six hundred sixty million, six hundred eighty-seven thousand, seven hundred seventy-four".