66636378 has 32 divisors (see below), whose sum is σ = 148348800. Its totient is φ = 22171968.

The previous prime is 66636343. The next prime is 66636397. The reversal of 66636378 is 87363666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53875 + ... + 55097.

It is an arithmetic number, because the mean of its divisors is an integer number (4635900).

Almost surely, 2^66636378 is an apocalyptic number.

66636378 is an abundant number, since it is smaller than the sum of its proper divisors (81712422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66636378 is a wasteful number, since it uses less digits than its factorization.

66636378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243 (or 2237 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 66636378 is about 8163.1108040991. The cubic root of 66636378 is about 405.4187164732.

It can be divided in two parts, 6663 and 6378, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 66636378 in words is "sixty-six million, six hundred thirty-six thousand, three hundred seventy-eight".