66560538 has 16 divisors (see below), whose sum is σ = 145223136. Its totient is φ = 20169840.

The previous prime is 66560537. The next prime is 66560569. The reversal of 66560538 is 83506566.

It is a junction number, because it is equal to n+sod(n) for n = 66560496 and 66560505.

It is not an unprimeable number, because it can be changed into a prime (66560537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504181 + ... + 504312.

It is an arithmetic number, because the mean of its divisors is an integer number (9076446).

Almost surely, 2^66560538 is an apocalyptic number.

66560538 is an abundant number, since it is smaller than the sum of its proper divisors (78662598).

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

66560538 is a wasteful number, since it uses less digits than its factorization.

66560538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008509.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66560538 is about 8158.4641937070. The cubic root of 66560538 is about 405.2648534317.

The spelling of 66560538 in words is "sixty-six million, five hundred sixty thousand, five hundred thirty-eight".