85409107987 has 4 divisors (see below), whose sum is σ = 97610409136. Its totient is φ = 73207806840.

The previous prime is 85409107967. The next prime is 85409108039. The reversal of 85409107987 is 78970190458.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78970190458 = 2 ⋅39485095229.

It is not a de Polignac number, because 85409107987 - 2¹⁹ = 85408583699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85409107967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6100650564 + ... + 6100650577.

It is an arithmetic number, because the mean of its divisors is an integer number (24402602284).

Almost surely, 2^85409107987 is an apocalyptic number.

85409107987 is a deficient number, since it is larger than the sum of its proper divisors (12201301149).

85409107987 is a wasteful number, since it uses less digits than its factorization.

85409107987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12201301148.

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 85409107987 in words is "eighty-five billion, four hundred nine million, one hundred seven thousand, nine hundred eighty-seven".