8145643868 has 12 divisors (see below), whose sum is σ = 14270953872. Its totient is φ = 4068228480.

The previous prime is 8145643853. The next prime is 8145643871. The reversal of 8145643868 is 8683465418.

It is a happy number.

It is a super-3 number, since 3×8145643868³ (a number of 31 digits) contains 333 as substring.

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, 1144373 + ... + 1151468.

It is an arithmetic number, because the mean of its divisors is an integer number (1189246156).

Almost surely, 2^8145643868 is an apocalyptic number.

It is an amenable number.

8145643868 is a deficient number, since it is larger than the sum of its proper divisors (6125310004).

8145643868 is a wasteful number, since it uses less digits than its factorization.

8145643868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296732 (or 2296730 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The square root of 8145643868 is about 90253.2208178744. The cubic root of 8145643868 is about 2012.0640717673.

The spelling of 8145643868 in words is "eight billion, one hundred forty-five million, six hundred forty-three thousand, eight hundred sixty-eight".