669522799 has 8 divisors (see below), whose sum is σ = 737090640. Its totient is φ = 603072000.

The previous prime is 669522793. The next prime is 669522811. The reversal of 669522799 is 997225966.

669522799 = T₃₉₉ + T₄₀₀ + ... + T₁₅₉₇.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669522799 - 2⁵ = 669522767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669522793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278002 + ... + 280399.

It is an arithmetic number, because the mean of its divisors is an integer number (92136330).

Almost surely, 2^669522799 is an apocalyptic number.

669522799 is a deficient number, since it is larger than the sum of its proper divisors (67567841).

669522799 is a wasteful number, since it uses less digits than its factorization.

669522799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558521.

The product of its digits is 3674160, while the sum is 55.

The square root of 669522799 is about 25875.1386276480. The cubic root of 669522799 is about 874.8262181137.

It can be divided in two parts, 66952 and 2799, that added together give a triangular number (69751 = T₃₇₃).

The spelling of 669522799 in words is "six hundred sixty-nine million, five hundred twenty-two thousand, seven hundred ninety-nine".