85517239109087 has 16 divisors (see below), whose sum is σ = 87283258739712. Its totient is φ = 83756880473760.

The previous prime is 85517239109083. The next prime is 85517239109119. The reversal of 85517239109087 is 78090193271558.

It is a cyclic number.

It is not a de Polignac number, because 85517239109087 - 2² = 85517239109083 is a prime.

It is a super-2 number, since 2×85517239109087² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85517239109083) 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, 853355738 + ... + 853455944.

It is an arithmetic number, because the mean of its divisors is an integer number (5455203671232).

Almost surely, 2^{85517239109087} is an apocalyptic number.

85517239109087 is a deficient number, since it is larger than the sum of its proper divisors (1766019630625).

85517239109087 is a wasteful number, since it uses less digits than its factorization.

85517239109087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128278.

The product of its (nonzero) digits is 38102400, while the sum is 65.

The spelling of 85517239109087 in words is "eighty-five trillion, five hundred seventeen billion, two hundred thirty-nine million, one hundred nine thousand, eighty-seven".