85541478021 has 12 divisors (see below), whose sum is σ = 123575444460. Its totient is φ = 57020483520.

The previous prime is 85541478019. The next prime is 85541478047. The reversal of 85541478021 is 12087414558.

85541478021 is a `hidden beast` number, since 8 + 5 + 541 + 4 + 7 + 80 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 68929877025 + 16611600996 = 262545^2 + 128886^2 .

It is not a de Polignac number, because 85541478021 - 2¹ = 85541478019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85541478521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 521290 + ... + 665451.

It is an arithmetic number, because the mean of its divisors is an integer number (10297953705).

Almost surely, 2^85541478021 is an apocalyptic number.

It is an amenable number.

85541478021 is a deficient number, since it is larger than the sum of its proper divisors (38033966439).

85541478021 is a wasteful number, since it uses less digits than its factorization.

85541478021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194756 (or 1194753 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 85541478021 in words is "eighty-five billion, five hundred forty-one million, four hundred seventy-eight thousand, twenty-one".