12000077865 has 12 divisors (see below), whose sum is σ = 20800135044. Its totient is φ = 6400041504.

The previous prime is 12000077849. The next prime is 12000077911. The reversal of 12000077865 is 56877000021.

It can be written as a sum of positive squares in 2 ways, for example, as 1945603881 + 10054473984 = 44109^2 + 100272^2 .

It is not a de Polignac number, because 12000077865 - 2⁴ = 12000077849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133334154 + ... + 133334243.

It is an arithmetic number, because the mean of its divisors is an integer number (1733344587).

Almost surely, 2^12000077865 is an apocalyptic number.

12000077865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12000077865 is a deficient number, since it is larger than the sum of its proper divisors (8800057179).

12000077865 is a wasteful number, since it uses less digits than its factorization.

12000077865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266668408 (or 266668405 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

Adding to 12000077865 its reverse (56877000021), we get a palindrome (68877077886).

The spelling of 12000077865 in words is "twelve billion, seventy-seven thousand, eight hundred sixty-five".