66540822 has 16 divisors (see below), whose sum is σ = 140910192. Its totient is φ = 20875520.

The previous prime is 66540821. The next prime is 66540833. The reversal of 66540822 is 22804566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326079 + ... + 326282.

It is an arithmetic number, because the mean of its divisors is an integer number (8806887).

Almost surely, 2^66540822 is an apocalyptic number.

66540822 is an abundant number, since it is smaller than the sum of its proper divisors (74369370).

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

66540822 is a wasteful number, since it uses less digits than its factorization.

66540822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652383.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 66540822 is about 8157.2557885603. The cubic root of 66540822 is about 405.2248347702.

The spelling of 66540822 in words is "sixty-six million, five hundred forty thousand, eight hundred twenty-two".