66421152 has 144 divisors (see below), whose sum is σ = 220776192. Its totient is φ = 18547200.

The previous prime is 66421151. The next prime is 66421153. The reversal of 66421152 is 25112466.

66421152 is a `hidden beast` number, since 6 + 642 + 1 + 15 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (66421151) and next prime (66421153).

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (66421151) 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, 94402 + ... + 95102.

It is an arithmetic number, because the mean of its divisors is an integer number (1533168).

Almost surely, 2^66421152 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 66421152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110388096).

66421152 is an abundant number, since it is smaller than the sum of its proper divisors (154355040).

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

66421152 is a wasteful number, since it uses less digits than its factorization.

66421152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 760 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 66421152 is about 8149.9173001939. The cubic root of 66421152 is about 404.9817641538.

The spelling of 66421152 in words is "sixty-six million, four hundred twenty-one thousand, one hundred fifty-two".