66865452 has 12 divisors (see below), whose sum is σ = 156019416. Its totient is φ = 22288480.

The previous prime is 66865451. The next prime is 66865483. The reversal of 66865452 is 25456866.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (66865451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2786049 + ... + 2786072.

It is an arithmetic number, because the mean of its divisors is an integer number (13001618).

Almost surely, 2^66865452 is an apocalyptic number.

It is an amenable number.

66865452 is an abundant number, since it is smaller than the sum of its proper divisors (89153964).

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

66865452 is a wasteful number, since it uses less digits than its factorization.

66865452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5572128 (or 5572126 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 66865452 is about 8177.1298143053. The cubic root of 66865452 is about 405.8827506476.

The spelling of 66865452 in words is "sixty-six million, eight hundred sixty-five thousand, four hundred fifty-two".