85721567801 has 8 divisors (see below), whose sum is σ = 89461832064. Its totient is φ = 81982406880.

The previous prime is 85721567777. The next prime is 85721567837. The reversal of 85721567801 is 10876512758.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85721567801 is a prime.

It is a super-2 number, since 2×85721567801² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85721567801.

It is not an unprimeable number, because it can be changed into a prime (85721567881) 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, 115061 + ... + 429746.

It is an arithmetic number, because the mean of its divisors is an integer number (11182729008).

Almost surely, 2^85721567801 is an apocalyptic number.

It is an amenable number.

85721567801 is a deficient number, since it is larger than the sum of its proper divisors (3740264263).

85721567801 is a wasteful number, since it uses less digits than its factorization.

85721567801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551671.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 85721567801 in words is "eighty-five billion, seven hundred twenty-one million, five hundred sixty-seven thousand, eight hundred one".