66116559 has 16 divisors (see below), whose sum is σ = 94235904. Its totient is φ = 41131200.

The previous prime is 66116551. The next prime is 66116563. The reversal of 66116559 is 95561166.

It is not a de Polignac number, because 66116559 - 2³ = 66116551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8857 + ... + 14514.

It is an arithmetic number, because the mean of its divisors is an integer number (5889744).

Almost surely, 2^66116559 is an apocalyptic number.

66116559 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66116559 is a deficient number, since it is larger than the sum of its proper divisors (28119345).

66116559 is a wasteful number, since it uses less digits than its factorization.

66116559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23438.

The product of its digits is 48600, while the sum is 39.

The square root of 66116559 is about 8131.2089507035. The cubic root of 66116559 is about 404.3617626041.

The spelling of 66116559 in words is "sixty-six million, one hundred sixteen thousand, five hundred fifty-nine".