66449320121 has 4 divisors (see below), whose sum is σ = 67703080932. Its totient is φ = 65195559312.

The previous prime is 66449320057. The next prime is 66449320187. The reversal of 66449320121 is 12102394466.

66449320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 34229070121 + 32220250000 = 185011^2 + 179500^2 .

It is a cyclic number.

It is not a de Polignac number, because 66449320121 - 2⁶ = 66449320057 is a prime.

It is a super-3 number, since 3×66449320121³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66449320321) 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, 626880326 + ... + 626880431.

It is an arithmetic number, because the mean of its divisors is an integer number (16925770233).

Almost surely, 2^66449320121 is an apocalyptic number.

It is an amenable number.

66449320121 is a deficient number, since it is larger than the sum of its proper divisors (1253760811).

66449320121 is a wasteful number, since it uses less digits than its factorization.

66449320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253760810.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 66449320121 in words is "sixty-six billion, four hundred forty-nine million, three hundred twenty thousand, one hundred twenty-one".