66487646 has 16 divisors (see below), whose sum is σ = 105761376. Its totient is φ = 31239936.

The previous prime is 66487643. The next prime is 66487693. The reversal of 66487646 is 64678466.

It is a self number, because there is not a number n which added to its sum of digits gives 66487646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66487643) 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, 30815 + ... + 32901.

It is an arithmetic number, because the mean of its divisors is an integer number (6610086).

Almost surely, 2^66487646 is an apocalyptic number.

66487646 is a deficient number, since it is larger than the sum of its proper divisors (39273730).

66487646 is a wasteful number, since it uses less digits than its factorization.

66487646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043.

The product of its digits is 1161216, while the sum is 47.

The square root of 66487646 is about 8153.9957076270. The cubic root of 66487646 is about 405.1168610593.

The spelling of 66487646 in words is "sixty-six million, four hundred eighty-seven thousand, six hundred forty-six".