66863168 has 14 divisors (see below), whose sum is σ = 132681726. Its totient is φ = 33431552.

The previous prime is 66863161. The next prime is 66863177. The reversal of 66863168 is 86136866.

It can be written as a sum of positive squares in only one way, i.e., 37356544 + 29506624 = 6112^2 + 5432^2 .

It is not an unprimeable number, because it can be changed into a prime (66863161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 522305 + ... + 522432.

Almost surely, 2^66863168 is an apocalyptic number.

It is an amenable number.

66863168 is a deficient number, since it is larger than the sum of its proper divisors (65818558).

66863168 is a wasteful number, since it uses less digits than its factorization.

66863168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044749 (or 1044739 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 66863168 is about 8176.9901553078. The cubic root of 66863168 is about 405.8781291940.

It can be divided in two parts, 668 and 63168, that added together give a palindrome (63836).

The spelling of 66863168 in words is "sixty-six million, eight hundred sixty-three thousand, one hundred sixty-eight".