66782563 has 8 divisors (see below), whose sum is σ = 70771680. Its totient is φ = 62905920.

The previous prime is 66782537. The next prime is 66782581. The reversal of 66782563 is 36528766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66782563 - 2¹⁷ = 66651491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66782503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26895 + ... + 29272.

It is an arithmetic number, because the mean of its divisors is an integer number (8846460).

Almost surely, 2^66782563 is an apocalyptic number.

66782563 is a deficient number, since it is larger than the sum of its proper divisors (3989117).

66782563 is a wasteful number, since it uses less digits than its factorization.

66782563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56237.

The product of its digits is 362880, while the sum is 43.

The square root of 66782563 is about 8172.0598994378. The cubic root of 66782563 is about 405.7149653130.

The spelling of 66782563 in words is "sixty-six million, seven hundred eighty-two thousand, five hundred sixty-three".