66425768 has 8 divisors (see below), whose sum is σ = 124548330. Its totient is φ = 33212880.

The previous prime is 66425761. The next prime is 66425791. The reversal of 66425768 is 86752466.

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 2137444 = 8018^2 + 1462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66425761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4151603 + ... + 4151618.

Almost surely, 2^66425768 is an apocalyptic number.

It is an amenable number.

66425768 is a deficient number, since it is larger than the sum of its proper divisors (58122562).

66425768 is a wasteful number, since it uses less digits than its factorization.

66425768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303227 (or 8303223 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The square root of 66425768 is about 8150.2004883316. The cubic root of 66425768 is about 404.9911454651.

The spelling of 66425768 in words is "sixty-six million, four hundred twenty-five thousand, seven hundred sixty-eight".