1681746680 has 16 divisors (see below), whose sum is σ = 3783930120. Its totient is φ = 672698656.

The previous prime is 1681746673. The next prime is 1681746697. The reversal of 1681746680 is 866471861.

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 3 ways as a sum of consecutive naturals, for example, 21021794 + ... + 21021873.

Almost surely, 2^1681746680 is an apocalyptic number.

1681746680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681746680 is an abundant number, since it is smaller than the sum of its proper divisors (2102183440).

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

1681746680 is a wasteful number, since it uses less digits than its factorization.

1681746680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42043678 (or 42043674 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1681746680 is about 41009.1048427054. The cubic root of 1681746680 is about 1189.1962371243.

The spelling of 1681746680 in words is "one billion, six hundred eighty-one million, seven hundred forty-six thousand, six hundred eighty".