85723008009 has 4 divisors (see below), whose sum is σ = 114297344016. Its totient is φ = 57148672004.

The previous prime is 85723007987. The next prime is 85723008023. The reversal of 85723008009 is 90080032758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85723008009 - 2⁸ = 85723007753 is a prime.

It is a super-2 number, since 2×85723008009² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85723000009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14287167999 + ... + 14287168004.

It is an arithmetic number, because the mean of its divisors is an integer number (28574336004).

Almost surely, 2^85723008009 is an apocalyptic number.

It is an amenable number.

85723008009 is a deficient number, since it is larger than the sum of its proper divisors (28574336007).

85723008009 is a wasteful number, since it uses less digits than its factorization.

85723008009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28574336006.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 85723008009 in words is "eighty-five billion, seven hundred twenty-three million, eight thousand, nine".