669270065 has 4 divisors (see below), whose sum is σ = 803124084. Its totient is φ = 535416048.

The previous prime is 669270037. The next prime is 669270073. The reversal of 669270065 is 560072966.

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 308915776 + 360354289 = 17576^2 + 18983^2 .

It is a cyclic number.

It is not a de Polignac number, because 669270065 - 2¹⁸ = 669007921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66927002 + ... + 66927011.

It is an arithmetic number, because the mean of its divisors is an integer number (200781021).

Almost surely, 2^669270065 is an apocalyptic number.

It is an amenable number.

669270065 is a deficient number, since it is larger than the sum of its proper divisors (133854019).

669270065 is a wasteful number, since it uses less digits than its factorization.

669270065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133854018.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 669270065 is about 25870.2544440521. The cubic root of 669270065 is about 874.7161266894.

The spelling of 669270065 in words is "six hundred sixty-nine million, two hundred seventy thousand, sixty-five".