66663360 has 168 divisors, whose sum is σ = 232989120. Its totient is φ = 17491968.

The previous prime is 66663353. The next prime is 66663379. The reversal of 66663360 is 6336666.

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, 227374 + ... + 227666.

It is an arithmetic number, because the mean of its divisors is an integer number (1386840).

Almost surely, 2^66663360 is an apocalyptic number.

66663360 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 66663360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116494560).

66663360 is an abundant number, since it is smaller than the sum of its proper divisors (166325760).

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

66663360 is a wasteful number, since it uses less digits than its factorization.

66663360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 36.

The square root of 66663360 is about 8164.7633156142. The cubic root of 66663360 is about 405.4734289892.

The spelling of 66663360 in words is "sixty-six million, six hundred sixty-three thousand, three hundred sixty".