669221536 has 12 divisors (see below), whose sum is σ = 1317529962. Its totient is φ = 334610752.

The previous prime is 669221519. The next prime is 669221551. The reversal of 669221536 is 635122966.

It can be written as a sum of positive squares in only one way, i.e., 499075600 + 170145936 = 22340^2 + 13044^2 .

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 as a sum of consecutive naturals, namely, 10456555 + ... + 10456618.

Almost surely, 2^669221536 is an apocalyptic number.

It is an amenable number.

669221536 is a deficient number, since it is larger than the sum of its proper divisors (648308426).

669221536 is a wasteful number, since it uses less digits than its factorization.

669221536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20913183 (or 20913175 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 669221536 is about 25869.3164965756. The cubic root of 669221536 is about 874.6949841904.

The spelling of 669221536 in words is "six hundred sixty-nine million, two hundred twenty-one thousand, five hundred thirty-six".