85591499721 has 32 divisors (see below), whose sum is σ = 143108017920. Its totient is φ = 44295323904.

The previous prime is 85591499713. The next prime is 85591499723. The reversal of 85591499721 is 12799419558.

It is not a de Polignac number, because 85591499721 - 2³ = 85591499713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85591499723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2943286 + ... + 2972223.

It is an arithmetic number, because the mean of its divisors is an integer number (4472125560).

Almost surely, 2^85591499721 is an apocalyptic number.

It is an amenable number.

85591499721 is a deficient number, since it is larger than the sum of its proper divisors (57516518199).

85591499721 is a wasteful number, since it uses less digits than its factorization.

85591499721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915585.

The product of its digits is 8164800, while the sum is 60.

The spelling of 85591499721 in words is "eighty-five billion, five hundred ninety-one million, four hundred ninety-nine thousand, seven hundred twenty-one".