66539055436 has 24 divisors (see below), whose sum is σ = 133102874016. Its totient is φ = 28511431680.

The previous prime is 66539055419. The next prime is 66539055437. The reversal of 66539055436 is 63455093566.

It is not an unprimeable number, because it can be changed into a prime (66539055437) 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 7 ways as a sum of consecutive naturals, for example, 66031 + ... + 370726.

It is an arithmetic number, because the mean of its divisors is an integer number (5545953084).

Almost surely, 2^66539055436 is an apocalyptic number.

It is an amenable number.

66539055436 is an abundant number, since it is smaller than the sum of its proper divisors (66563818580).

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

66539055436 is a wasteful number, since it uses less digits than its factorization.

66539055436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442209 (or 442207 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 52.

The spelling of 66539055436 in words is "sixty-six billion, five hundred thirty-nine million, fifty-five thousand, four hundred thirty-six".