66509233755 has 32 divisors (see below), whose sum is σ = 107062179840. Its totient is φ = 35256299520.

The previous prime is 66509233751. The next prime is 66509233787. The reversal of 66509233755 is 55733290566.

It is not a de Polignac number, because 66509233755 - 2² = 66509233751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66509233698 and 66509233707.

It is not an unprimeable number, because it can be changed into a prime (66509233751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2128636 + ... + 2159654.

It is an arithmetic number, because the mean of its divisors is an integer number (3345693120).

Almost surely, 2^66509233755 is an apocalyptic number.

66509233755 is a deficient number, since it is larger than the sum of its proper divisors (40552946085).

66509233755 is a wasteful number, since it uses less digits than its factorization.

66509233755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31891.

The product of its (nonzero) digits is 5103000, while the sum is 51.

The spelling of 66509233755 in words is "sixty-six billion, five hundred nine million, two hundred thirty-three thousand, seven hundred fifty-five".