66751608 has 128 divisors (see below), whose sum is σ = 213373440. Its totient is φ = 16896000.

The previous prime is 66751561. The next prime is 66751627. The reversal of 66751608 is 80615766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75328 + ... + 76208.

It is an arithmetic number, because the mean of its divisors is an integer number (1666980).

Almost surely, 2^66751608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66751608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106686720).

66751608 is an abundant number, since it is smaller than the sum of its proper divisors (146621832).

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

66751608 is a wasteful number, since it uses less digits than its factorization.

66751608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 945 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 66751608 is about 8170.1657265933. The cubic root of 66751608 is about 405.6522700669.

The spelling of 66751608 in words is "sixty-six million, seven hundred fifty-one thousand, six hundred eight".