66356991356 has 12 divisors (see below), whose sum is σ = 117152388192. Its totient is φ = 32884880448.

The previous prime is 66356991347. The next prime is 66356991359. The reversal of 66356991356 is 65319965366.

It is a junction number, because it is equal to n+sod(n) for n = 66356991295 and 66356991304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66356991359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73403300 + ... + 73404203.

It is an arithmetic number, because the mean of its divisors is an integer number (9762699016).

Almost surely, 2^66356991356 is an apocalyptic number.

It is an amenable number.

66356991356 is a deficient number, since it is larger than the sum of its proper divisors (50795396836).

66356991356 is a wasteful number, since it uses less digits than its factorization.

66356991356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146807620 (or 146807618 counting only the distinct ones).

The product of its digits is 23619600, while the sum is 59.

The spelling of 66356991356 in words is "sixty-six billion, three hundred fifty-six million, nine hundred ninety-one thousand, three hundred fifty-six".