1680802281 has 6 divisors (see below), whose sum is σ = 2427825530. Its totient is φ = 1120534848.

The previous prime is 1680802273. The next prime is 1680802283. The reversal of 1680802281 is 1822080861.

It can be written as a sum of positive squares in only one way, i.e., 1197506025 + 483296256 = 34605^2 + 21984^2 .

It is not a de Polignac number, because 1680802281 - 2³ = 1680802273 is a prime.

It is a super-2 number, since 2×1680802281² = 5650192615629605922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1680802283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93377896 + ... + 93377913.

Almost surely, 2^1680802281 is an apocalyptic number.

It is an amenable number.

1680802281 is a deficient number, since it is larger than the sum of its proper divisors (747023249).

1680802281 is a wasteful number, since it uses less digits than its factorization.

1680802281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186755815 (or 186755812 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1680802281 is about 40997.5887217773. The cubic root of 1680802281 is about 1188.9735943921.

The spelling of 1680802281 in words is "one billion, six hundred eighty million, eight hundred two thousand, two hundred eighty-one".