669395698 has 4 divisors (see below), whose sum is σ = 1004093550. Its totient is φ = 334697848.

The previous prime is 669395693. The next prime is 669395717. The reversal of 669395698 is 896593966.

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

It can be written as a sum of positive squares in only one way, i.e., 497602249 + 171793449 = 22307^2 + 13107^2 .

It is not an unprimeable number, because it can be changed into a prime (669395693) 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 as a sum of consecutive naturals, namely, 167348923 + ... + 167348926.

Almost surely, 2^669395698 is an apocalyptic number.

669395698 is a deficient number, since it is larger than the sum of its proper divisors (334697852).

669395698 is a wasteful number, since it uses less digits than its factorization.

669395698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334697851.

The product of its digits is 18895680, while the sum is 61.

The square root of 669395698 is about 25872.6824662616. The cubic root of 669395698 is about 874.7708561334.

The spelling of 669395698 in words is "six hundred sixty-nine million, three hundred ninety-five thousand, six hundred ninety-eight".