85511370820 has 12 divisors (see below), whose sum is σ = 179573878764. Its totient is φ = 34204548320.

The previous prime is 85511370809. The next prime is 85511370821. The reversal of 85511370820 is 2807311558.

It can be written as a sum of positive squares in 2 ways, for example, as 48097753344 + 37413617476 = 219312^2 + 193426^2 .

It is not an unprimeable number, because it can be changed into a prime (85511370821) 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, 2137784251 + ... + 2137784290.

It is an arithmetic number, because the mean of its divisors is an integer number (14964489897).

Almost surely, 2^85511370820 is an apocalyptic number.

It is an amenable number.

85511370820 is an abundant number, since it is smaller than the sum of its proper divisors (94062507944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85511370820 is a wasteful number, since it uses less digits than its factorization.

85511370820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275568550 (or 4275568548 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 85511370820 in words is "eighty-five billion, five hundred eleven million, three hundred seventy thousand, eight hundred twenty".