66761036721111 has 8 divisors (see below), whose sum is σ = 89041121668224. Its totient is φ = 44494154794040.

The previous prime is 66761036721083. The next prime is 66761036721133. The reversal of 66761036721111 is 11112763016766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66761036721111 - 2¹⁹ = 66761036196823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761036721611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3300743211 + ... + 3300763436.

It is an arithmetic number, because the mean of its divisors is an integer number (11130140208528).

Almost surely, 2^{66761036721111} is an apocalyptic number.

66761036721111 is a deficient number, since it is larger than the sum of its proper divisors (22280084947113).

66761036721111 is a wasteful number, since it uses less digits than its factorization.

66761036721111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601510021.

The product of its (nonzero) digits is 381024, while the sum is 48.

Adding to 66761036721111 its reverse (11112763016766), we get a palindrome (77873799737877).

The spelling of 66761036721111 in words is "sixty-six trillion, seven hundred sixty-one billion, thirty-six million, seven hundred twenty-one thousand, one hundred eleven".