66720363 has 16 divisors (see below), whose sum is σ = 90380160. Its totient is φ = 43775424.

The previous prime is 66720349. The next prime is 66720373. The reversal of 66720363 is 36302766.

It is not a de Polignac number, because 66720363 - 2⁶ = 66720299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66720373) 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, 75120 + ... + 76002.

It is an arithmetic number, because the mean of its divisors is an integer number (5648760).

Almost surely, 2^66720363 is an apocalyptic number.

66720363 is a deficient number, since it is larger than the sum of its proper divisors (23659797).

66720363 is a wasteful number, since it uses less digits than its factorization.

66720363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 27216, while the sum is 33.

The square root of 66720363 is about 8168.2533628677. The cubic root of 66720363 is about 405.5889678052.

The spelling of 66720363 in words is "sixty-six million, seven hundred twenty thousand, three hundred sixty-three".