66554136 has 80 divisors (see below), whose sum is σ = 203381640. Its totient is φ = 20165760.

The previous prime is 66554119. The next prime is 66554149. The reversal of 66554136 is 63145566.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66554136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2460 + ... + 11796.

Almost surely, 2^66554136 is an apocalyptic number.

66554136 is a gapful number since it is divisible by the number (66) 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 66554136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101690820).

66554136 is an abundant number, since it is smaller than the sum of its proper divisors (136827504).

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

66554136 is a wasteful number, since it uses less digits than its factorization.

66554136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366 (or 9353 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66554136 is about 8158.0718310150. The cubic root of 66554136 is about 405.2518598029.

The spelling of 66554136 in words is "sixty-six million, five hundred fifty-four thousand, one hundred thirty-six".