66446644 has 48 divisors (see below), whose sum is σ = 130386816. Its totient is φ = 29376000.

The previous prime is 66446621. The next prime is 66446651. The reversal of 66446644 is 44664466.

It is a happy number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66446597 and 66446606.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439969 + ... + 440119.

It is an arithmetic number, because the mean of its divisors is an integer number (2716392).

Almost surely, 2^66446644 is an apocalyptic number.

It is an amenable number.

66446644 is a deficient number, since it is larger than the sum of its proper divisors (63940172).

66446644 is a wasteful number, since it uses less digits than its factorization.

66446644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 374 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The square root of 66446644 is about 8151.4810924150. The cubic root of 66446644 is about 405.0335673037.

The spelling of 66446644 in words is "sixty-six million, four hundred forty-six thousand, six hundred forty-four".