66787863 has 8 divisors (see below), whose sum is σ = 90510576. Its totient is φ = 43795200.

The previous prime is 66787829. The next prime is 66787873. The reversal of 66787863 is 36878766.

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

It is not a de Polignac number, because 66787863 - 2¹² = 66783767 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66787873) 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, 182298 + ... + 182663.

It is an arithmetic number, because the mean of its divisors is an integer number (11313822).

Almost surely, 2^66787863 is an apocalyptic number.

66787863 is a deficient number, since it is larger than the sum of its proper divisors (23722713).

66787863 is a wasteful number, since it uses less digits than its factorization.

66787863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365025.

The product of its digits is 2032128, while the sum is 51.

The square root of 66787863 is about 8172.3841686499. The cubic root of 66787863 is about 405.7256978174.

It can be divided in two parts, 6678 and 7863, that added together give a palindrome (14541).

The spelling of 66787863 in words is "sixty-six million, seven hundred eighty-seven thousand, eight hundred sixty-three".