66418560 has 192 divisors, whose sum is σ = 247272480. Its totient is φ = 16330752.

The previous prime is 66418511. The next prime is 66418571. The reversal of 66418560 is 6581466.

66418560 is a `hidden beast` number, since 6 + 641 + 8 + 5 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×66418560² = 8822850224947200, which contains 22 as substring.

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, 74437 + ... + 75323.

Almost surely, 2^66418560 is an apocalyptic number.

66418560 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 66418560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123636240).

66418560 is an abundant number, since it is smaller than the sum of its proper divisors (180853920).

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

66418560 is a wasteful number, since it uses less digits than its factorization.

66418560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66418560 is about 8149.7582786240. The cubic root of 66418560 is about 404.9764961211.

The spelling of 66418560 in words is "sixty-six million, four hundred eighteen thousand, five hundred sixty".