66366720 has 216 divisors, whose sum is σ = 262743936. Its totient is φ = 15151104.

The previous prime is 66366683. The next prime is 66366731. The reversal of 66366720 is 2766366.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80229 + ... + 81051.

Almost surely, 2^66366720 is an apocalyptic number.

66366720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66366720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131371968).

66366720 is an abundant number, since it is smaller than the sum of its proper divisors (196377216).

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

66366720 is a wasteful number, since it uses less digits than its factorization.

66366720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 66366720 is about 8146.5771953625. The cubic root of 66366720 is about 404.8711066743.

The spelling of 66366720 in words is "sixty-six million, three hundred sixty-six thousand, seven hundred twenty".