66475968 has 56 divisors (see below), whose sum is σ = 189421008. Its totient is φ = 20453376.

The previous prime is 66475963. The next prime is 66475973. The reversal of 66475968 is 86957466.

It is an interprime number because it is at equal distance from previous prime (66475963) and next prime (66475973).

It is a self number, because there is not a number n which added to its sum of digits gives 66475968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66475963) 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, 10821 + ... + 15812.

It is an arithmetic number, because the mean of its divisors is an integer number (3382518).

Almost surely, 2^66475968 is an apocalyptic number.

It is an amenable number.

66475968 is an abundant number, since it is smaller than the sum of its proper divisors (122945040).

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

66475968 is a wasteful number, since it uses less digits than its factorization.

66475968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26661 (or 26651 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The square root of 66475968 is about 8153.2795855410. The cubic root of 66475968 is about 405.0931412056.

The spelling of 66475968 in words is "sixty-six million, four hundred seventy-five thousand, nine hundred sixty-eight".