1691996885 has 8 divisors (see below), whose sum is σ = 2049372576. Its totient is φ = 1340946640.

The previous prime is 1691996861. The next prime is 1691996921. The reversal of 1691996885 is 5886991961.

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

It is not a de Polignac number, because 1691996885 - 2⁸ = 1691996629 is a prime.

It is a Duffinian 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580771 + ... + 1581840.

It is an arithmetic number, because the mean of its divisors is an integer number (256171572).

Almost surely, 2^1691996885 is an apocalyptic number.

It is an amenable number.

1691996885 is a deficient number, since it is larger than the sum of its proper divisors (357375691).

1691996885 is a wasteful number, since it uses less digits than its factorization.

1691996885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3162723.

The product of its digits is 8398080, while the sum is 62.

The square root of 1691996885 is about 41133.8897382681. The cubic root of 1691996885 is about 1191.6073857960.

The spelling of 1691996885 in words is "one billion, six hundred ninety-one million, nine hundred ninety-six thousand, eight hundred eighty-five".