1642876805671 has 2 divisors, whose sum is σ = 1642876805672. Its totient is φ = 1642876805670.

The previous prime is 1642876805641. The next prime is 1642876805729. The reversal of 1642876805671 is 1765086782461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642876805671 - 2²⁵ = 1642843251239 is a prime.

It is a super-2 number, since 2×1642876805671² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642876805621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821438402835 + 821438402836.

It is an arithmetic number, because the mean of its divisors is an integer number (821438402836).

Almost surely, 2^{1642876805671} is an apocalyptic number.

1642876805671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642876805671 is an equidigital number, since it uses as much as digits as its factorization.

1642876805671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 1642876805671 in words is "one trillion, six hundred forty-two billion, eight hundred seventy-six million, eight hundred five thousand, six hundred seventy-one".