842787556887851 has 2 divisors, whose sum is σ = 842787556887852. Its totient is φ = 842787556887850.

The previous prime is 842787556887847. The next prime is 842787556887863. The reversal of 842787556887851 is 158788655787248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842787556887851 - 2² = 842787556887847 is a prime.

It is not a weakly prime, because it can be changed into another prime (842787556887251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421393778443925 + 421393778443926.

It is an arithmetic number, because the mean of its divisors is an integer number (421393778443926).

Almost surely, 2^{842787556887851} is an apocalyptic number.

842787556887851 is a deficient number, since it is larger than the sum of its proper divisors (1).

842787556887851 is an equidigital number, since it uses as much as digits as its factorization.

842787556887851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67436544000, while the sum is 89.

The spelling of 842787556887851 in words is "eight hundred forty-two trillion, seven hundred eighty-seven billion, five hundred fifty-six million, eight hundred eighty-seven thousand, eight hundred fifty-one".