1678855765771 has 2 divisors, whose sum is σ = 1678855765772. Its totient is φ = 1678855765770.

The previous prime is 1678855765759. The next prime is 1678855765813. The reversal of 1678855765771 is 1775675588761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1678855765771 - 2⁵ = 1678855765739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1678855765694 and 1678855765703.

It is not a weakly prime, because it can be changed into another prime (1678855765751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839427882885 + 839427882886.

It is an arithmetic number, because the mean of its divisors is an integer number (839427882886).

Almost surely, 2^{1678855765771} is an apocalyptic number.

1678855765771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678855765771 is an equidigital number, since it uses as much as digits as its factorization.

1678855765771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691488000, while the sum is 73.

The spelling of 1678855765771 in words is "one trillion, six hundred seventy-eight billion, eight hundred fifty-five million, seven hundred sixty-five thousand, seven hundred seventy-one".