1691680005 has 32 divisors (see below), whose sum is σ = 3031142400. Its totient is φ = 895116096.

The previous prime is 1691679971. The next prime is 1691680031. The reversal of 1691680005 is 5000861961.

It is not a de Polignac number, because 1691680005 - 2⁸ = 1691679749 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32190 + ... + 66479.

It is an arithmetic number, because the mean of its divisors is an integer number (94723200).

Almost surely, 2^1691680005 is an apocalyptic number.

1691680005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1691680005 is a deficient number, since it is larger than the sum of its proper divisors (1339462395).

1691680005 is a wasteful number, since it uses less digits than its factorization.

1691680005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98810 (or 98804 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1691680005 is about 41130.0377461534. The cubic root of 1691680005 is about 1191.5329924117.

The spelling of 1691680005 in words is "one billion, six hundred ninety-one million, six hundred eighty thousand, five".