84956855865961 has 2 divisors, whose sum is σ = 84956855865962. Its totient is φ = 84956855865960.

The previous prime is 84956855865929. The next prime is 84956855865967. The reversal of 84956855865961 is 16956855865948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83265971750361 + 1690884115600 = 9125019^2 + 1300340^2 .

It is a cyclic number.

It is not a de Polignac number, because 84956855865961 - 2⁵ = 84956855865929 is a prime.

It is not a weakly prime, because it can be changed into another prime (84956855865967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42478427932980 + 42478427932981.

It is an arithmetic number, because the mean of its divisors is an integer number (42478427932981).

Almost surely, 2^{84956855865961} is an apocalyptic number.

It is an amenable number.

84956855865961 is a deficient number, since it is larger than the sum of its proper divisors (1).

84956855865961 is an equidigital number, since it uses as much as digits as its factorization.

84956855865961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22394880000, while the sum is 85.

The spelling of 84956855865961 in words is "eighty-four trillion, nine hundred fifty-six billion, eight hundred fifty-five million, eight hundred sixty-five thousand, nine hundred sixty-one".