667040865 has 32 divisors (see below), whose sum is σ = 1086383232. Its totient is φ = 349440000.

The previous prime is 667040837. The next prime is 667040867. The reversal of 667040865 is 568040766.

It is a happy number.

It is not a de Polignac number, because 667040865 - 2¹¹ = 667038817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667040867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196785 + ... + 200145.

It is an arithmetic number, because the mean of its divisors is an integer number (33949476).

Almost surely, 2^667040865 is an apocalyptic number.

It is an amenable number.

667040865 is a deficient number, since it is larger than the sum of its proper divisors (419342367).

667040865 is a wasteful number, since it uses less digits than its factorization.

667040865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 667040865 is about 25827.1342777320. The cubic root of 667040865 is about 873.7438803422.

Subtracting from 667040865 its reverse (568040766), we obtain a palindrome (99000099).

The spelling of 667040865 in words is "six hundred sixty-seven million, forty thousand, eight hundred sixty-five".