8505881819 has 4 divisors (see below), whose sum is σ = 8506269696. Its totient is φ = 8505493944.

The previous prime is 8505881809. The next prime is 8505881837. The reversal of 8505881819 is 9181885058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9181885058 = 2 ⋅4590942529.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8505881819 is a prime.

It is a super-2 number, since 2×8505881819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8505881809) 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, 158939 + ... + 205604.

It is an arithmetic number, because the mean of its divisors is an integer number (2126567424).

Almost surely, 2^8505881819 is an apocalyptic number.

8505881819 is a deficient number, since it is larger than the sum of its proper divisors (387877).

8505881819 is a wasteful number, since it uses less digits than its factorization.

8505881819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387876.

The product of its (nonzero) digits is 921600, while the sum is 53.

The square root of 8505881819 is about 92227.3376987539. The cubic root of 8505881819 is about 2041.2981788231.

The spelling of 8505881819 in words is "eight billion, five hundred five million, eight hundred eighty-one thousand, eight hundred nineteen".