66863912 has 16 divisors (see below), whose sum is σ = 127088340. Its totient is φ = 32973696.

The previous prime is 66863911. The next prime is 66863957. The reversal of 66863912 is 21936866.

66863912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65189476 + 1674436 = 8074^2 + 1294^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66863912.

It is not an unprimeable number, because it can be changed into a prime (66863911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56663 + ... + 57830.

Almost surely, 2^66863912 is an apocalyptic number.

It is an amenable number.

66863912 is a deficient number, since it is larger than the sum of its proper divisors (60224428).

66863912 is a wasteful number, since it uses less digits than its factorization.

66863912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114572 (or 114568 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 66863912 is about 8177.0356486932. The cubic root of 66863912 is about 405.8796346178.

The spelling of 66863912 in words is "sixty-six million, eight hundred sixty-three thousand, nine hundred twelve".