66553312 has 24 divisors (see below), whose sum is σ = 149745456. Its totient is φ = 28522752.

The previous prime is 66553303. The next prime is 66553321. The reversal of 66553312 is 21335566.

It is an interprime number because it is at equal distance from previous prime (66553303) and next prime (66553321).

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, 148333 + ... + 148780.

It is an arithmetic number, because the mean of its divisors is an integer number (6239394).

Almost surely, 2^66553312 is an apocalyptic number.

It is an amenable number.

66553312 is an abundant number, since it is smaller than the sum of its proper divisors (83192144).

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

66553312 is a wasteful number, since it uses less digits than its factorization.

66553312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297130 (or 297122 counting only the distinct ones).

The product of its digits is 16200, while the sum is 31.

The square root of 66553312 is about 8158.0213287292. The cubic root of 66553312 is about 405.2501873352.

Adding to 66553312 its reverse (21335566), we get a palindrome (87888878).

The spelling of 66553312 in words is "sixty-six million, five hundred fifty-three thousand, three hundred twelve".