85540643569 has 8 divisors (see below), whose sum is σ = 89125256448. Its totient is φ = 82007608080.

The previous prime is 85540643567. The next prime is 85540643597. The reversal of 85540643569 is 96534604558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85540643569 - 2¹ = 85540643567 is a prime.

It is a super-2 number, since 2×85540643569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85540643561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12890962 + ... + 12897595.

It is an arithmetic number, because the mean of its divisors is an integer number (11140657056).

Almost surely, 2^85540643569 is an apocalyptic number.

It is an amenable number.

85540643569 is a deficient number, since it is larger than the sum of its proper divisors (3584612879).

85540643569 is a wasteful number, since it uses less digits than its factorization.

85540643569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25788695.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 85540643569 in words is "eighty-five billion, five hundred forty million, six hundred forty-three thousand, five hundred sixty-nine".