1691640966 has 8 divisors (see below), whose sum is σ = 3383281944. Its totient is φ = 563880320.

The previous prime is 1691640943. The next prime is 1691640989. The reversal of 1691640966 is 6690461961.

It is an interprime number because it is at equal distance from previous prime (1691640943) and next prime (1691640989).

It is a sphenic number, since it is the product of 3 distinct primes.

1691640966 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140970075 + ... + 140970086.

It is an arithmetic number, because the mean of its divisors is an integer number (422910243).

Almost surely, 2^1691640966 is an apocalyptic number.

1691640966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691640966 is a wasteful number, since it uses less digits than its factorization.

1691640966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281940166.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 1691640966 is about 41129.5631632528. The cubic root of 1691640966 is about 1191.5238266487.

The spelling of 1691640966 in words is "one billion, six hundred ninety-one million, six hundred forty thousand, nine hundred sixty-six".