11728780346566 has 4 divisors (see below), whose sum is σ = 17593170519852. Its totient is φ = 5864390173282.

The previous prime is 11728780346527. The next prime is 11728780346567. The reversal of 11728780346566 is 66564308782711.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 11728780346498 and 11728780346507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11728780346567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2932195086640 + ... + 2932195086643.

It is an arithmetic number, because the mean of its divisors is an integer number (4398292629963).

Almost surely, 2^{11728780346566} is an apocalyptic number.

11728780346566 is a deficient number, since it is larger than the sum of its proper divisors (5864390173286).

11728780346566 is an equidigital number, since it uses as much as digits as its factorization.

11728780346566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5864390173285.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 11728780346566 in words is "eleven trillion, seven hundred twenty-eight billion, seven hundred eighty million, three hundred forty-six thousand, five hundred sixty-six".