66986644 has 12 divisors (see below), whose sum is σ = 118639584. Its totient is φ = 33089624.

The previous prime is 66986641. The next prime is 66986659. The reversal of 66986644 is 44668966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100552 + ... + 101215.

It is an arithmetic number, because the mean of its divisors is an integer number (9886632).

Almost surely, 2^66986644 is an apocalyptic number.

It is an amenable number.

66986644 is a deficient number, since it is larger than the sum of its proper divisors (51652940).

66986644 is a wasteful number, since it uses less digits than its factorization.

66986644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201854 (or 201852 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 49.

The square root of 66986644 is about 8184.5368836606. The cubic root of 66986644 is about 406.1278201732.

The spelling of 66986644 in words is "sixty-six million, nine hundred eighty-six thousand, six hundred forty-four".