66543015 has 64 divisors (see below), whose sum is σ = 140590080. Its totient is φ = 26019840.

The previous prime is 66543011. The next prime is 66543017. The reversal of 66543015 is 51034566.

It is not a de Polignac number, because 66543015 - 2² = 66543011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66543011) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 17941 + ... + 21329.

It is an arithmetic number, because the mean of its divisors is an integer number (2196720).

Almost surely, 2^66543015 is an apocalyptic number.

66543015 is an abundant number, since it is smaller than the sum of its proper divisors (74047065).

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

66543015 is a wasteful number, since it uses less digits than its factorization.

66543015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66543015 is about 8157.3902076583. The cubic root of 66543015 is about 405.2292864150.

It can be divided in two parts, 6654 and 3015, that added together give a palindrome (9669).

The spelling of 66543015 in words is "sixty-six million, five hundred forty-three thousand, fifteen".