85785851513 has 4 divisors (see below), whose sum is σ = 89515671168. Its totient is φ = 82056031860.

The previous prime is 85785851483. The next prime is 85785851527. The reversal of 85785851513 is 31515858758.

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 85785851513 - 2¹⁰ = 85785850489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85785841513) 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, 1864909793 + ... + 1864909838.

It is an arithmetic number, because the mean of its divisors is an integer number (22378917792).

Almost surely, 2^85785851513 is an apocalyptic number.

It is an amenable number.

85785851513 is a deficient number, since it is larger than the sum of its proper divisors (3729819655).

85785851513 is a wasteful number, since it uses less digits than its factorization.

85785851513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729819654.

The product of its digits is 6720000, while the sum is 56.

The spelling of 85785851513 in words is "eighty-five billion, seven hundred eighty-five million, eight hundred fifty-one thousand, five hundred thirteen".