85648261521 has 16 divisors (see below), whose sum is σ = 117096969600. Its totient is φ = 55665765120.

The previous prime is 85648261463. The next prime is 85648261529. The reversal of 85648261521 is 12516284658.

It is not a de Polignac number, because 85648261521 - 2¹³ = 85648253329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85648261529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050221 + ... + 2091578.

It is an arithmetic number, because the mean of its divisors is an integer number (7318560600).

Almost surely, 2^85648261521 is an apocalyptic number.

It is an amenable number.

85648261521 is a deficient number, since it is larger than the sum of its proper divisors (31448708079).

85648261521 is a wasteful number, since it uses less digits than its factorization.

85648261521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141976.

The product of its digits is 921600, while the sum is 48.

The spelling of 85648261521 in words is "eighty-five billion, six hundred forty-eight million, two hundred sixty-one thousand, five hundred twenty-one".