66995552 has 24 divisors (see below), whose sum is σ = 142044336. Its totient is φ = 30920832.

The previous prime is 66995519. The next prime is 66995561. The reversal of 66995552 is 25559966.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66995497 and 66995506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80108 + ... + 80939.

It is an arithmetic number, because the mean of its divisors is an integer number (5918514).

Almost surely, 2^66995552 is an apocalyptic number.

It is an amenable number.

66995552 is an abundant number, since it is smaller than the sum of its proper divisors (75048784).

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

66995552 is a wasteful number, since it uses less digits than its factorization.

66995552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161070 (or 161062 counting only the distinct ones).

The product of its digits is 729000, while the sum is 47.

The square root of 66995552 is about 8185.0810625186. The cubic root of 66995552 is about 406.1458219024.

The spelling of 66995552 in words is "sixty-six million, nine hundred ninety-five thousand, five hundred fifty-two".