669206864 has 20 divisors (see below), whose sum is σ = 1331632404. Its totient is φ = 325559808.

The previous prime is 669206843. The next prime is 669206869. The reversal of 669206864 is 468602966.

It can be written as a sum of positive squares in 2 ways, for example, as 571592464 + 97614400 = 23908^2 + 9880^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669206869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564617 + ... + 565800.

Almost surely, 2^669206864 is an apocalyptic number.

It is an amenable number.

669206864 is a deficient number, since it is larger than the sum of its proper divisors (662425540).

669206864 is a wasteful number, since it uses less digits than its factorization.

669206864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130462 (or 1130456 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 669206864 is about 25869.0329158243. The cubic root of 669206864 is about 874.6885918784.

The spelling of 669206864 in words is "six hundred sixty-nine million, two hundred six thousand, eight hundred sixty-four".