66545340 has 48 divisors (see below), whose sum is σ = 188891808. Its totient is φ = 17501184.

The previous prime is 66545329. The next prime is 66545341. The reversal of 66545340 is 4354566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3217 + ... + 11976.

It is an arithmetic number, because the mean of its divisors is an integer number (3935246).

Almost surely, 2^66545340 is an apocalyptic number.

66545340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66545340 is an abundant number, since it is smaller than the sum of its proper divisors (122346468).

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

66545340 is a wasteful number, since it uses less digits than its factorization.

66545340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15278 (or 15276 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 66545340 is about 8157.5327152271. The cubic root of 66545340 is about 405.2340059042.

The spelling of 66545340 in words is "sixty-six million, five hundred forty-five thousand, three hundred forty".