669040469 has 8 divisors (see below), whose sum is σ = 692415000. Its totient is φ = 645686272.

The previous prime is 669040451. The next prime is 669040513. The reversal of 669040469 is 964040966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35259844 + 633780625 = 5938^2 + 25175^2 .

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 669040469 - 2⁸ = 669040213 is a prime.

It is a super-2 number, since 2×669040469² = 895230298319479922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669040069) 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, 96677 + ... + 103365.

It is an arithmetic number, because the mean of its divisors is an integer number (86551875).

Almost surely, 2^669040469 is an apocalyptic number.

It is an amenable number.

669040469 is a deficient number, since it is larger than the sum of its proper divisors (23374531).

669040469 is a wasteful number, since it uses less digits than its factorization.

669040469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10167.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 669040469 is about 25865.8166118915. The cubic root of 669040469 is about 874.6160901949.

The spelling of 669040469 in words is "six hundred sixty-nine million, forty thousand, four hundred sixty-nine".