66810552 has 16 divisors (see below), whose sum is σ = 167026440. Its totient is φ = 22270176.

The previous prime is 66810551. The next prime is 66810563. The reversal of 66810552 is 25501866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66810551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391863 + ... + 1391910.

Almost surely, 2^66810552 is an apocalyptic number.

It is an amenable number.

66810552 is an abundant number, since it is smaller than the sum of its proper divisors (100215888).

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

66810552 is a wasteful number, since it uses less digits than its factorization.

66810552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783782 (or 2783778 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 66810552 is about 8173.7722013768. The cubic root of 66810552 is about 405.7716366437.

The spelling of 66810552 in words is "sixty-six million, eight hundred ten thousand, five hundred fifty-two".