1680828280861 has 4 divisors (see below), whose sum is σ = 1682723240352. Its totient is φ = 1678933321372.

The previous prime is 1680828280823. The next prime is 1680828280871.

1680828280861 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1680828280861 - 2⁹ = 1680828280349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1680828280796 and 1680828280805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680828280871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947478415 + ... + 947480188.

It is an arithmetic number, because the mean of its divisors is an integer number (420680810088).

Almost surely, 2^{1680828280861} is an apocalyptic number.

It is an amenable number.

1680828280861 is a deficient number, since it is larger than the sum of its proper divisors (1894959491).

1680828280861 is an equidigital number, since it uses as much as digits as its factorization.

1680828280861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894959490.

The product of its (nonzero) digits is 4718592, while the sum is 58.

The spelling of 1680828280861 in words is "one trillion, six hundred eighty billion, eight hundred twenty-eight million, two hundred eighty thousand, eight hundred sixty-one".