66655544 has 8 divisors (see below), whose sum is σ = 124979160. Its totient is φ = 33327768.

The previous prime is 66655513. The next prime is 66655573. The reversal of 66655544 is 44555666.

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

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

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, 4165964 + ... + 4165979.

It is an arithmetic number, because the mean of its divisors is an integer number (15622395).

Almost surely, 2^66655544 is an apocalyptic number.

It is an amenable number.

66655544 is a deficient number, since it is larger than the sum of its proper divisors (58323616).

66655544 is a wasteful number, since it uses less digits than its factorization.

66655544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331949 (or 8331945 counting only the distinct ones).

The product of its digits is 432000, while the sum is 41.

The square root of 66655544 is about 8164.2846594175. The cubic root of 66655544 is about 405.4575816822.

The spelling of 66655544 in words is "sixty-six million, six hundred fifty-five thousand, five hundred forty-four".