66851340 has 96 divisors (see below), whose sum is σ = 197116416. Its totient is φ = 16896000.

The previous prime is 66851311. The next prime is 66851377. The reversal of 66851340 is 4315866.

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, 266215 + ... + 266465.

It is an arithmetic number, because the mean of its divisors is an integer number (2053296).

Almost surely, 2^66851340 is an apocalyptic number.

66851340 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 66851340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98558208).

66851340 is an abundant number, since it is smaller than the sum of its proper divisors (130265076).

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

66851340 is a wasteful number, since it uses less digits than its factorization.

66851340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 477 counting only the distinct ones).

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

The square root of 66851340 is about 8176.2668743137. The cubic root of 66851340 is about 405.8541946933.

The spelling of 66851340 in words is "sixty-six million, eight hundred fifty-one thousand, three hundred forty".