66532563 has 16 divisors (see below), whose sum is σ = 99225600. Its totient is φ = 44058600.

The previous prime is 66532519. The next prime is 66532597. The reversal of 66532563 is 36523566.

66532563 is a `hidden beast` number, since 6 + 65 + 32 + 563 = 666.

It is not a de Polignac number, because 66532563 - 2¹² = 66528467 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66532363) 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 15 ways as a sum of consecutive naturals, for example, 4083 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (6201600).

Almost surely, 2^66532563 is an apocalyptic number.

66532563 is a deficient number, since it is larger than the sum of its proper divisors (32693037).

66532563 is a wasteful number, since it uses less digits than its factorization.

66532563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16479 (or 16473 counting only the distinct ones).

The product of its digits is 97200, while the sum is 36.

The square root of 66532563 is about 8156.7495364269. The cubic root of 66532563 is about 405.2080686694.

It can be divided in two parts, 6653 and 2563, that added together give a square (9216 = 96²).

The spelling of 66532563 in words is "sixty-six million, five hundred thirty-two thousand, five hundred sixty-three".