669682567 has 4 divisors (see below), whose sum is σ = 669754480. Its totient is φ = 669610656.

The previous prime is 669682523. The next prime is 669682577. The reversal of 669682567 is 765286966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 765286966 = 2 ⋅382643483.

It is a cyclic number.

It is not a de Polignac number, because 669682567 - 2²³ = 661293959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669682577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19467 + ... + 41452.

It is an arithmetic number, because the mean of its divisors is an integer number (167438620).

Almost surely, 2^669682567 is an apocalyptic number.

669682567 is a deficient number, since it is larger than the sum of its proper divisors (71913).

669682567 is a wasteful number, since it uses less digits than its factorization.

669682567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71912.

The product of its digits is 6531840, while the sum is 55.

The square root of 669682567 is about 25878.2257312977. The cubic root of 669682567 is about 874.8957990745.

The spelling of 669682567 in words is "six hundred sixty-nine million, six hundred eighty-two thousand, five hundred sixty-seven".