66231340 has 72 divisors (see below), whose sum is σ = 170357040. Its totient is φ = 21506688.

The previous prime is 66231323. The next prime is 66231349. The reversal of 66231340 is 4313266.

It is not an unprimeable number, because it can be changed into a prime (66231349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16842 + ... + 20398.

It is an arithmetic number, because the mean of its divisors is an integer number (2366070).

Almost surely, 2^66231340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66231340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85178520).

66231340 is an abundant number, since it is smaller than the sum of its proper divisors (104125700).

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

66231340 is a wasteful number, since it uses less digits than its factorization.

66231340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599 (or 3590 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66231340 is about 8138.2639426354. The cubic root of 66231340 is about 404.5956234086.

The spelling of 66231340 in words is "sixty-six million, two hundred thirty-one thousand, three hundred forty".