669767149 has 4 divisors (see below), whose sum is σ = 669819964. Its totient is φ = 669714336.

The previous prime is 669767113. The next prime is 669767171. The reversal of 669767149 is 941767966.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 137311524 + 532455625 = 11718^2 + 23075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669767149 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 669767149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669767849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5329 + ... + 36985.

It is an arithmetic number, because the mean of its divisors is an integer number (167454991).

Almost surely, 2^669767149 is an apocalyptic number.

It is an amenable number.

669767149 is a deficient number, since it is larger than the sum of its proper divisors (52815).

669767149 is a wasteful number, since it uses less digits than its factorization.

669767149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52814.

The product of its digits is 3429216, while the sum is 55.

The square root of 669767149 is about 25879.8599107491. The cubic root of 669767149 is about 874.9326311125.

The spelling of 669767149 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, one hundred forty-nine".