665769672 has 32 divisors (see below), whose sum is σ = 1849360800. Its totient is φ = 221923152.

The previous prime is 665769667. The next prime is 665769673. The reversal of 665769672 is 276967566.

665769672 is a `hidden beast` number, since 6 + 6 + 576 + 9 + 67 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (665769673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540918 + ... + 1541349.

It is an arithmetic number, because the mean of its divisors is an integer number (57792525).

Almost surely, 2^665769672 is an apocalyptic number.

It is an amenable number.

665769672 is an abundant number, since it is smaller than the sum of its proper divisors (1183591128).

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

665769672 is a wasteful number, since it uses less digits than its factorization.

665769672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082282 (or 3082272 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The square root of 665769672 is about 25802.5129008785. The cubic root of 665769672 is about 873.1884903754.

The spelling of 665769672 in words is "six hundred sixty-five million, seven hundred sixty-nine thousand, six hundred seventy-two".