66381602 has 16 divisors (see below), whose sum is σ = 117468672. Its totient is φ = 27531360.

The previous prime is 66381593. The next prime is 66381619. The reversal of 66381602 is 20618366.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76043 + ... + 76910.

It is an arithmetic number, because the mean of its divisors is an integer number (7341792).

Almost surely, 2^66381602 is an apocalyptic number.

66381602 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66381602 is a deficient number, since it is larger than the sum of its proper divisors (51087070).

66381602 is a wasteful number, since it uses less digits than its factorization.

66381602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152993.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66381602 is about 8147.4905339006. The cubic root of 66381602 is about 404.9013670292.

Adding to 66381602 its reverse (20618366), we get a palindrome (86999968).

The spelling of 66381602 in words is "sixty-six million, three hundred eighty-one thousand, six hundred two".