85751729999 has 4 divisors (see below), whose sum is σ = 92348016936. Its totient is φ = 79155443064.

The previous prime is 85751729981. The next prime is 85751730007. The reversal of 85751729999 is 99992715758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85751729999 - 2⁸ = 85751729743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85751729939) 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, 3298143449 + ... + 3298143474.

It is an arithmetic number, because the mean of its divisors is an integer number (23087004234).

Almost surely, 2^85751729999 is an apocalyptic number.

85751729999 is a deficient number, since it is larger than the sum of its proper divisors (6596286937).

85751729999 is a wasteful number, since it uses less digits than its factorization.

85751729999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596286936.

The product of its digits is 128595600, while the sum is 71.

The spelling of 85751729999 in words is "eighty-five billion, seven hundred fifty-one million, seven hundred twenty-nine thousand, nine hundred ninety-nine".