667736065 has 4 divisors (see below), whose sum is σ = 801283284. Its totient is φ = 534188848.

The previous prime is 667736011. The next prime is 667736089. The reversal of 667736065 is 560637766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 228372544 + 439363521 = 15112^2 + 20961^2 .

It is a cyclic number.

It is not a de Polignac number, because 667736065 - 2¹³ = 667727873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66773602 + ... + 66773611.

It is an arithmetic number, because the mean of its divisors is an integer number (200320821).

Almost surely, 2^667736065 is an apocalyptic number.

It is an amenable number.

667736065 is a deficient number, since it is larger than the sum of its proper divisors (133547219).

667736065 is a wasteful number, since it uses less digits than its factorization.

667736065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133547218.

The product of its (nonzero) digits is 952560, while the sum is 46.

The square root of 667736065 is about 25840.5894863101. The cubic root of 667736065 is about 874.0473179457.

The spelling of 667736065 in words is "six hundred sixty-seven million, seven hundred thirty-six thousand, sixty-five".