85500778085 has 8 divisors (see below), whose sum is σ = 102767227416. Its totient is φ = 68289760000.

The previous prime is 85500778073. The next prime is 85500778087. The reversal of 85500778085 is 58087700558.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1459927681 + 84040850404 = 38209^2 + 289898^2 .

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

It is not a de Polignac number, because 85500778085 - 2³² = 81205810789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85500778087) 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, 13854416 + ... + 13860585.

It is an arithmetic number, because the mean of its divisors is an integer number (12845903427).

Almost surely, 2^85500778085 is an apocalyptic number.

It is an amenable number.

85500778085 is a deficient number, since it is larger than the sum of its proper divisors (17266449331).

85500778085 is a wasteful number, since it uses less digits than its factorization.

85500778085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27715623.

The product of its (nonzero) digits is 3136000, while the sum is 53.

The spelling of 85500778085 in words is "eighty-five billion, five hundred million, seven hundred seventy-eight thousand, eighty-five".