665699067 has 40 divisors (see below), whose sum is σ = 1141968960. Its totient is φ = 382209840.

The previous prime is 665699063. The next prime is 665699077. The reversal of 665699067 is 760996566.

It is not a de Polignac number, because 665699067 - 2² = 665699063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665699063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2733 + ... + 36590.

It is an arithmetic number, because the mean of its divisors is an integer number (28549224).

Almost surely, 2^665699067 is an apocalyptic number.

665699067 is a deficient number, since it is larger than the sum of its proper divisors (476269893).

665699067 is a wasteful number, since it uses less digits than its factorization.

665699067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39365 (or 39356 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The square root of 665699067 is about 25801.1446839089. The cubic root of 665699067 is about 873.1576220158.

The spelling of 665699067 in words is "six hundred sixty-five million, six hundred ninety-nine thousand, sixty-seven".