66185340 has 96 divisors (see below), whose sum is σ = 203466816. Its totient is φ = 15974400.

The previous prime is 66185333. The next prime is 66185363. The reversal of 66185340 is 4358166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40540 + ... + 42140.

It is an arithmetic number, because the mean of its divisors is an integer number (2119446).

Almost surely, 2^66185340 is an apocalyptic number.

66185340 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 66185340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101733408).

66185340 is an abundant number, since it is smaller than the sum of its proper divisors (137281476).

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

66185340 is a wasteful number, since it uses less digits than its factorization.

66185340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66185340 is about 8135.4372961753. The cubic root of 66185340 is about 404.5019330746.

The spelling of 66185340 in words is "sixty-six million, one hundred eighty-five thousand, three hundred forty".