669706097 has 4 divisors (see below), whose sum is σ = 669845220. Its totient is φ = 669566976.

The previous prime is 669706073. The next prime is 669706117. The reversal of 669706097 is 790607966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 267944161 + 401761936 = 16369^2 + 20044^2 .

It is a cyclic number.

It is not a de Polignac number, because 669706097 - 2⁶ = 669706033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669706057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62072 + ... + 72057.

It is an arithmetic number, because the mean of its divisors is an integer number (167461305).

Almost surely, 2^669706097 is an apocalyptic number.

It is an amenable number.

669706097 is a deficient number, since it is larger than the sum of its proper divisors (139123).

669706097 is a wasteful number, since it uses less digits than its factorization.

669706097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139122.

The product of its (nonzero) digits is 857304, while the sum is 50.

The square root of 669706097 is about 25878.6803566179. The cubic root of 669706097 is about 874.9060457486.

The spelling of 669706097 in words is "six hundred sixty-nine million, seven hundred six thousand, ninety-seven".