66554556 has 48 divisors (see below), whose sum is σ = 158850720. Its totient is φ = 21683200.

The previous prime is 66554503. The next prime is 66554557. The reversal of 66554556 is 65545566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107560 + ... + 108176.

It is an arithmetic number, because the mean of its divisors is an integer number (3309390).

Almost surely, 2^66554556 is an apocalyptic number.

It is an amenable number.

66554556 is an abundant number, since it is smaller than the sum of its proper divisors (92296164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66554556 is a wasteful number, since it uses less digits than its factorization.

66554556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 812 counting only the distinct ones).

The product of its digits is 540000, while the sum is 42.

The square root of 66554556 is about 8158.0975723510. The cubic root of 66554556 is about 405.2527122689.

It can be divided in two parts, 6655 and 4556, that added together give a palindrome (11211).

The spelling of 66554556 in words is "sixty-six million, five hundred fifty-four thousand, five hundred fifty-six".