1687838720411 has 2 divisors, whose sum is σ = 1687838720412. Its totient is φ = 1687838720410.

The previous prime is 1687838720357. The next prime is 1687838720453. The reversal of 1687838720411 is 1140278387861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687838720411 is a prime.

It is a super-2 number, since 2×1687838720411² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1687838720471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843919360205 + 843919360206.

It is an arithmetic number, because the mean of its divisors is an integer number (843919360206).

Almost surely, 2^{1687838720411} is an apocalyptic number.

1687838720411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687838720411 is an equidigital number, since it uses as much as digits as its factorization.

1687838720411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3612672, while the sum is 56.

The spelling of 1687838720411 in words is "one trillion, six hundred eighty-seven billion, eight hundred thirty-eight million, seven hundred twenty thousand, four hundred eleven".