669556775 has 24 divisors (see below), whose sum is σ = 842331504. Its totient is φ = 527904000.

The previous prime is 669556763. The next prime is 669556787. The reversal of 669556775 is 577655966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (669556763) and next prime (669556787).

It is not a de Polignac number, because 669556775 - 2²² = 665362471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669556775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 714107 + ... + 715043.

It is an arithmetic number, because the mean of its divisors is an integer number (35097146).

Almost surely, 2^669556775 is an apocalyptic number.

669556775 is a deficient number, since it is larger than the sum of its proper divisors (172774729).

669556775 is a wasteful number, since it uses less digits than its factorization.

669556775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1326 counting only the distinct ones).

The product of its digits is 11907000, while the sum is 56.

The square root of 669556775 is about 25875.7951568643. The cubic root of 669556775 is about 874.8410160130.

The spelling of 669556775 in words is "six hundred sixty-nine million, five hundred fifty-six thousand, seven hundred seventy-five".