66963778 has 32 divisors (see below), whose sum is σ = 117089280. Its totient is φ = 28131840.

The previous prime is 66963773. The next prime is 66963779. The reversal of 66963778 is 87736966.

It is not an unprimeable number, because it can be changed into a prime (66963773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277738 + ... + 277978.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^66963778 is an apocalyptic number.

66963778 is a deficient number, since it is larger than the sum of its proper divisors (50125502).

66963778 is a wasteful number, since it uses less digits than its factorization.

66963778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562.

The product of its digits is 2286144, while the sum is 52.

The square root of 66963778 is about 8183.1398619356. The cubic root of 66963778 is about 406.0816041166.

The spelling of 66963778 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred seventy-eight".