85828421131561 has 4 divisors (see below), whose sum is σ = 86615837839300. Its totient is φ = 85041004423824.

The previous prime is 85828421131543. The next prime is 85828421131591. The reversal of 85828421131561 is 16513112482858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65618505275625 + 20209915855936 = 8100525^2 + 4495544^2 .

It is not a de Polignac number, because 85828421131561 - 2⁹ = 85828421131049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85828421131501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393708353706 + ... + 393708353923.

It is an arithmetic number, because the mean of its divisors is an integer number (21653959459825).

Almost surely, 2^{85828421131561} is an apocalyptic number.

It is an amenable number.

85828421131561 is a deficient number, since it is larger than the sum of its proper divisors (787416707739).

85828421131561 is a wasteful number, since it uses less digits than its factorization.

85828421131561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787416707738.

The product of its digits is 3686400, while the sum is 55.

The spelling of 85828421131561 in words is "eighty-five trillion, eight hundred twenty-eight billion, four hundred twenty-one million, one hundred thirty-one thousand, five hundred sixty-one".