66447506 has 16 divisors (see below), whose sum is σ = 104328000. Its totient is φ = 31680528.

The previous prime is 66447473. The next prime is 66447517. The reversal of 66447506 is 60574466.

It is a self number, because there is not a number n which added to its sum of digits gives 66447506.

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, 13985 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (6520500).

Almost surely, 2^66447506 is an apocalyptic number.

66447506 is a deficient number, since it is larger than the sum of its proper divisors (37880494).

66447506 is a wasteful number, since it uses less digits than its factorization.

66447506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 66447506 is about 8151.5339660704. The cubic root of 66447506 is about 405.0353187712.

The spelling of 66447506 in words is "sixty-six million, four hundred forty-seven thousand, five hundred six".