66663544 has 16 divisors (see below), whose sum is σ = 125548200. Its totient is φ = 33184032.

The previous prime is 66663517. The next prime is 66663563. The reversal of 66663544 is 44536666.

It is a junction number, because it is equal to n+sod(n) for n = 66663497 and 66663506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16539 + ... + 20170.

Almost surely, 2^66663544 is an apocalyptic number.

It is an amenable number.

66663544 is a deficient number, since it is larger than the sum of its proper divisors (58884656).

66663544 is a wasteful number, since it uses less digits than its factorization.

66663544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36942 (or 36938 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 66663544 is about 8164.7745835387. The cubic root of 66663544 is about 405.4738020429.

The spelling of 66663544 in words is "sixty-six million, six hundred sixty-three thousand, five hundred forty-four".