66555000 has 320 divisors, whose sum is σ = 253044000. Its totient is φ = 16128000.

The previous prime is 66554987. The next prime is 66555023. The reversal of 66555000 is 55566.

66555000 is a `hidden beast` number, since 6 + 655 + 5 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2294986 + ... + 2295014.

Almost surely, 2^66555000 is an apocalyptic number.

66555000 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 66555000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126522000).

66555000 is an abundant number, since it is smaller than the sum of its proper divisors (186489000).

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

66555000 is a wasteful number, since it uses less digits than its factorization.

66555000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 66555000 is about 8158.1247845323. The cubic root of 66555000 is about 405.2536134434.

The spelling of 66555000 in words is "sixty-six million, five hundred fifty-five thousand".