66841968 has 20 divisors (see below), whose sum is σ = 172675208. Its totient is φ = 22280640.

The previous prime is 66841963. The next prime is 66841969. The reversal of 66841968 is 86914866.

It is a super-2 number, since 2×66841968² = 8935697372226048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1392541 = 66841968 / (6 + 6 + 8 + 4 + 1 + 9 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66841963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696223 + ... + 696318.

Almost surely, 2^66841968 is an apocalyptic number.

It is an amenable number.

66841968 is an abundant number, since it is smaller than the sum of its proper divisors (105833240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66841968 is a wasteful number, since it uses less digits than its factorization.

66841968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392552 (or 1392546 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 66841968 is about 8175.6937320328. The cubic root of 66841968 is about 405.8352280166.

The spelling of 66841968 in words is "sixty-six million, eight hundred forty-one thousand, nine hundred sixty-eight".