85391406005 has 4 divisors (see below), whose sum is σ = 102469687212. Its totient is φ = 68313124800.

The previous prime is 85391405971. The next prime is 85391406029. The reversal of 85391406005 is 50060419358.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16402181041 + 68989224964 = 128071^2 + 262658^2 .

It is not a de Polignac number, because 85391406005 - 2⁶ = 85391405941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8539140596 + ... + 8539140605.

It is an arithmetic number, because the mean of its divisors is an integer number (25617421803).

Almost surely, 2^85391406005 is an apocalyptic number.

It is an amenable number.

85391406005 is a deficient number, since it is larger than the sum of its proper divisors (17078281207).

85391406005 is a wasteful number, since it uses less digits than its factorization.

85391406005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17078281206.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 85391406005 in words is "eighty-five billion, three hundred ninety-one million, four hundred six thousand, five".