85805637121 has 8 divisors (see below), whose sum is σ = 86189209704. Its totient is φ = 85422195840.

The previous prime is 85805637067. The next prime is 85805637139. The reversal of 85805637121 is 12173650858.

It can be written as a sum of positive squares in 4 ways, for example, as 1194462721 + 84611174400 = 34561^2 + 290880^2 .

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 85805637121 - 2¹¹ = 85805635073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85805637161) 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, 1419895 + ... + 1479091.

It is an arithmetic number, because the mean of its divisors is an integer number (10773651213).

Almost surely, 2^85805637121 is an apocalyptic number.

It is an amenable number.

85805637121 is a deficient number, since it is larger than the sum of its proper divisors (383572583).

85805637121 is a wasteful number, since it uses less digits than its factorization.

85805637121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65651.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 85805637121 in words is "eighty-five billion, eight hundred five million, six hundred thirty-seven thousand, one hundred twenty-one".