66554560 has 56 divisors (see below), whose sum is σ = 159325056. Its totient is φ = 26480640.

The previous prime is 66554557. The next prime is 66554563. The reversal of 66554560 is 6545566.

It is an interprime number because it is at equal distance from previous prime (66554557) and next prime (66554563).

It is not an unprimeable number, because it can be changed into a prime (66554563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76689 + ... + 77551.

Almost surely, 2^66554560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66554560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79662528).

66554560 is an abundant number, since it is smaller than the sum of its proper divisors (92770496).

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

66554560 is a wasteful number, since it uses less digits than its factorization.

66554560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1111 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 66554560 is about 8158.0978175062. The cubic root of 66554560 is about 405.2527203876.

It can be divided in two parts, 665 and 54560, that added together give a square (55225 = 235²).

The spelling of 66554560 in words is "sixty-six million, five hundred fifty-four thousand, five hundred sixty".