8145311855 has 4 divisors (see below), whose sum is σ = 9774374232. Its totient is φ = 6516249480.

The previous prime is 8145311803. The next prime is 8145311857. The reversal of 8145311855 is 5581135418.

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

It is not a de Polignac number, because 8145311855 - 2¹⁸ = 8145049711 is a prime.

It is a super-2 number, since 2×8145311855² (a number of 21 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 (8145311857) 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, 814531181 + ... + 814531190.

It is an arithmetic number, because the mean of its divisors is an integer number (2443593558).

Almost surely, 2^8145311855 is an apocalyptic number.

8145311855 is a deficient number, since it is larger than the sum of its proper divisors (1629062377).

8145311855 is a wasteful number, since it uses less digits than its factorization.

8145311855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629062376.

The product of its digits is 96000, while the sum is 41.

The square root of 8145311855 is about 90251.3814575711. The cubic root of 8145311855 is about 2012.0367344356.

The spelling of 8145311855 in words is "eight billion, one hundred forty-five million, three hundred eleven thousand, eight hundred fifty-five".