85437785138 has 32 divisors (see below), whose sum is σ = 135855059760. Its totient is φ = 40226314240.

The previous prime is 85437785137. The next prime is 85437785161. The reversal of 85437785138 is 83158773458.

It can be written as a sum of positive squares in 8 ways, for example, as 51278243809 + 34159541329 = 226447^2 + 184823^2 .

It is not an unprimeable number, because it can be changed into a prime (85437785137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12678506 + ... + 12685242.

Almost surely, 2^85437785138 is an apocalyptic number.

85437785138 is a deficient number, since it is larger than the sum of its proper divisors (50417274622).

85437785138 is a wasteful number, since it uses less digits than its factorization.

85437785138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12142.

The product of its digits is 22579200, while the sum is 59.

The spelling of 85437785138 in words is "eighty-five billion, four hundred thirty-seven million, seven hundred eighty-five thousand, one hundred thirty-eight".