1681776926651 has 2 divisors, whose sum is σ = 1681776926652. Its totient is φ = 1681776926650.

The previous prime is 1681776926639. The next prime is 1681776926659. The reversal of 1681776926651 is 1566296771861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681776926651 - 2³⁸ = 1406899019707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681776926659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840888463325 + 840888463326.

It is an arithmetic number, because the mean of its divisors is an integer number (840888463326).

Almost surely, 2^{1681776926651} is an apocalyptic number.

1681776926651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681776926651 is an equidigital number, since it uses as much as digits as its factorization.

1681776926651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 65.

The spelling of 1681776926651 in words is "one trillion, six hundred eighty-one billion, seven hundred seventy-six million, nine hundred twenty-six thousand, six hundred fifty-one".