669547768 has 8 divisors (see below), whose sum is σ = 1255402080. Its totient is φ = 334773880.

The previous prime is 669547729. The next prime is 669547787. The reversal of 669547768 is 867745966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41846728 + ... + 41846743.

It is an arithmetic number, because the mean of its divisors is an integer number (156925260).

Almost surely, 2^669547768 is an apocalyptic number.

It is an amenable number.

669547768 is a deficient number, since it is larger than the sum of its proper divisors (585854312).

669547768 is a wasteful number, since it uses less digits than its factorization.

669547768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83693477 (or 83693473 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 58.

The square root of 669547768 is about 25875.6211133182. The cubic root of 669547768 is about 874.8370931550.

The spelling of 669547768 in words is "six hundred sixty-nine million, five hundred forty-seven thousand, seven hundred sixty-eight".