669006544 has 20 divisors (see below), whose sum is σ = 1296603396. Its totient is φ = 334399232.

The previous prime is 669006521. The next prime is 669006563. The reversal of 669006544 is 445600966.

It can be written as a sum of positive squares in 2 ways, for example, as 224640144 + 444366400 = 14988^2 + 21080^2 .

It is a junction number, because it is equal to n+sod(n) for n = 669006497 and 669006506.

It is a congruent 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, 89412 + ... + 96604.

Almost surely, 2^669006544 is an apocalyptic number.

It is an amenable number.

669006544 is a deficient number, since it is larger than the sum of its proper divisors (627596852).

669006544 is a wasteful number, since it uses less digits than its factorization.

669006544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13014 (or 13008 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 669006544 is about 25865.1608152743. The cubic root of 669006544 is about 874.6013069076.

The spelling of 669006544 in words is "six hundred sixty-nine million, six thousand, five hundred forty-four".