66555416 has 8 divisors (see below), whose sum is σ = 124791420. Its totient is φ = 33277704.

The previous prime is 66555409. The next prime is 66555427. The reversal of 66555416 is 61455566.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66555416.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4159706 + ... + 4159721.

Almost surely, 2^66555416 is an apocalyptic number.

It is an amenable number.

66555416 is a deficient number, since it is larger than the sum of its proper divisors (58236004).

66555416 is a wasteful number, since it uses less digits than its factorization.

66555416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319433 (or 8319429 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 66555416 is about 8158.1502805477. The cubic root of 66555416 is about 405.2544577834.

The spelling of 66555416 in words is "sixty-six million, five hundred fifty-five thousand, four hundred sixteen".