85621457645 has 4 divisors (see below), whose sum is σ = 102745749180. Its totient is φ = 68497166112.

The previous prime is 85621457617. The next prime is 85621457659. The reversal of 85621457645 is 54675412658.

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 56921370724 + 28700086921 = 238582^2 + 169411^2 .

It is a cyclic number.

It is not a de Polignac number, because 85621457645 - 2¹² = 85621453549 is a prime.

It is a super-3 number, since 3×85621457645³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

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, 8562145760 + ... + 8562145769.

It is an arithmetic number, because the mean of its divisors is an integer number (25686437295).

Almost surely, 2^85621457645 is an apocalyptic number.

It is an amenable number.

85621457645 is a deficient number, since it is larger than the sum of its proper divisors (17124291535).

85621457645 is a wasteful number, since it uses less digits than its factorization.

85621457645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17124291534.

The product of its digits is 8064000, while the sum is 53.

The spelling of 85621457645 in words is "eighty-five billion, six hundred twenty-one million, four hundred fifty-seven thousand, six hundred forty-five".