66330121511 has 4 divisors (see below), whose sum is σ = 66713532792. Its totient is φ = 65946710232.

The previous prime is 66330121469. The next prime is 66330121523. The reversal of 66330121511 is 11512103366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66330121511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66330120511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191705381 + ... + 191705726.

It is an arithmetic number, because the mean of its divisors is an integer number (16678383198).

Almost surely, 2^66330121511 is an apocalyptic number.

66330121511 is a deficient number, since it is larger than the sum of its proper divisors (383411281).

66330121511 is a wasteful number, since it uses less digits than its factorization.

66330121511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383411280.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 66330121511 its reverse (11512103366), we get a palindrome (77842224877).

The spelling of 66330121511 in words is "sixty-six billion, three hundred thirty million, one hundred twenty-one thousand, five hundred eleven".