85908987709 has 4 divisors (see below), whose sum is σ = 85911953920. Its totient is φ = 85906021500.

The previous prime is 85908987707. The next prime is 85908987713. The reversal of 85908987709 is 90778980958.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85908987709 - 2¹ = 85908987707 is a prime.

It is a super-2 number, since 2×85908987709² (a number of 23 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 (85908987707) 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, 1439229 + ... + 1497730.

It is an arithmetic number, because the mean of its divisors is an integer number (21477988480).

Almost surely, 2^85908987709 is an apocalyptic number.

It is an amenable number.

85908987709 is a deficient number, since it is larger than the sum of its proper divisors (2966211).

85908987709 is a wasteful number, since it uses less digits than its factorization.

85908987709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966210.

The product of its (nonzero) digits is 91445760, while the sum is 70.

The spelling of 85908987709 in words is "eighty-five billion, nine hundred eight million, nine hundred eighty-seven thousand, seven hundred nine".