85221856136 has 16 divisors (see below), whose sum is σ = 159832509900. Its totient is φ = 42599853504.

The previous prime is 85221856117. The next prime is 85221856141. The reversal of 85221856136 is 63165812258.

It can be written as a sum of positive squares in 2 ways, for example, as 82294396900 + 2927459236 = 286870^2 + 54106^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351571 + ... + 1413218.

Almost surely, 2^85221856136 is an apocalyptic number.

It is an amenable number.

85221856136 is a deficient number, since it is larger than the sum of its proper divisors (74610653764).

85221856136 is a wasteful number, since it uses less digits than its factorization.

85221856136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768648 (or 2768644 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The spelling of 85221856136 in words is "eighty-five billion, two hundred twenty-one million, eight hundred fifty-six thousand, one hundred thirty-six".