66550520 has 16 divisors (see below), whose sum is σ = 149738760. Its totient is φ = 26620192.

The previous prime is 66550513. The next prime is 66550537. The reversal of 66550520 is 2505566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831842 + ... + 831921.

Almost surely, 2^66550520 is an apocalyptic number.

It is an amenable number.

66550520 is an abundant number, since it is smaller than the sum of its proper divisors (83188240).

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

66550520 is a wasteful number, since it uses less digits than its factorization.

66550520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663774 (or 1663770 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 66550520 is about 8157.8502070092. The cubic root of 66550520 is about 405.2445203278.

The spelling of 66550520 in words is "sixty-six million, five hundred fifty thousand, five hundred twenty".