665768268 has 48 divisors (see below), whose sum is σ = 1882984320. Its totient is φ = 201747600.

The previous prime is 665768267. The next prime is 665768273. The reversal of 665768268 is 862867566.

665768268 is a `hidden beast` number, since 6 + 6 + 576 + 8 + 2 + 68 = 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 (665768267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279018 + ... + 281393.

It is an arithmetic number, because the mean of its divisors is an integer number (39228840).

Almost surely, 2^665768268 is an apocalyptic number.

It is an amenable number.

665768268 is an abundant number, since it is smaller than the sum of its proper divisors (1217216052).

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

665768268 is a wasteful number, since it uses less digits than its factorization.

665768268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560435 (or 560427 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 665768268 is about 25802.4856942117. The cubic root of 665768268 is about 873.1878765707.

The spelling of 665768268 in words is "six hundred sixty-five million, seven hundred sixty-eight thousand, two hundred sixty-eight".