66903644 has 12 divisors (see below), whose sum is σ = 118492584. Its totient is φ = 33048624.

The previous prime is 66903593. The next prime is 66903647. The reversal of 66903644 is 44630966.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66903598 and 66903607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66903647) 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, 100427 + ... + 101090.

It is an arithmetic number, because the mean of its divisors is an integer number (9874382).

Almost surely, 2^66903644 is an apocalyptic number.

It is an amenable number.

66903644 is a deficient number, since it is larger than the sum of its proper divisors (51588940).

66903644 is a wasteful number, since it uses less digits than its factorization.

66903644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201604 (or 201602 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 66903644 is about 8179.4647746659. The cubic root of 66903644 is about 405.9600128866.

The spelling of 66903644 in words is "sixty-six million, nine hundred three thousand, six hundred forty-four".