66567106121 has 4 divisors (see below), whose sum is σ = 66569294532. Its totient is φ = 66564917712.

The previous prime is 66567106117. The next prime is 66567106139. The reversal of 66567106121 is 12160176566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8611840000 + 57955266121 = 92800^2 + 240739^2 .

It is a cyclic number.

It is not a de Polignac number, because 66567106121 - 2² = 66567106117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66567106421) 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, 1047926 + ... + 1109631.

It is an arithmetic number, because the mean of its divisors is an integer number (16642323633).

Almost surely, 2^66567106121 is an apocalyptic number.

It is an amenable number.

66567106121 is a deficient number, since it is larger than the sum of its proper divisors (2188411).

66567106121 is a wasteful number, since it uses less digits than its factorization.

66567106121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188410.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 66567106121 in words is "sixty-six billion, five hundred sixty-seven million, one hundred six thousand, one hundred twenty-one".