669688375 has 16 divisors (see below), whose sum is σ = 842171616. Its totient is φ = 531648000.

The previous prime is 669688351. The next prime is 669688391. The reversal of 669688375 is 573886966.

It is not a de Polignac number, because 669688375 - 2⁵ = 669688343 is a prime.

It is a super-2 number, since 2×669688375² = 896965039220281250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 4074 + ... + 36823.

It is an arithmetic number, because the mean of its divisors is an integer number (52635726).

Almost surely, 2^669688375 is an apocalyptic number.

669688375 is a deficient number, since it is larger than the sum of its proper divisors (172483241).

669688375 is a wasteful number, since it uses less digits than its factorization.

669688375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41043 (or 41033 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The square root of 669688375 is about 25878.3379489487. The cubic root of 669688375 is about 874.8983283226.

The spelling of 669688375 in words is "six hundred sixty-nine million, six hundred eighty-eight thousand, three hundred seventy-five".