66656944 has 40 divisors (see below), whose sum is σ = 139133952. Its totient is φ = 30845760.

The previous prime is 66656929. The next prime is 66656963. The reversal of 66656944 is 44965666.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 66656894 and 66656903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8487 + ... + 14329.

Almost surely, 2^66656944 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 66656944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69566976).

66656944 is an abundant number, since it is smaller than the sum of its proper divisors (72477008).

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

66656944 is a wasteful number, since it uses less digits than its factorization.

66656944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905 (or 5899 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 66656944 is about 8164.3703982610. The cubic root of 66656944 is about 405.4604203390.

It can be divided in two parts, 66656 and 944, that added together give a square (67600 = 260²).

The spelling of 66656944 in words is "sixty-six million, six hundred fifty-six thousand, nine hundred forty-four".