66450121 has 4 divisors (see below), whose sum is σ = 66631552. Its totient is φ = 66268692.

The previous prime is 66450101. The next prime is 66450149. The reversal of 66450121 is 12105466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66450121 - 2⁹ = 66449609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90165 + ... + 90898.

It is an arithmetic number, because the mean of its divisors is an integer number (16657888).

Almost surely, 2^66450121 is an apocalyptic number.

It is an amenable number.

66450121 is a deficient number, since it is larger than the sum of its proper divisors (181431).

66450121 is a wasteful number, since it uses less digits than its factorization.

66450121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181430.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 66450121 is about 8151.6943637504. The cubic root of 66450121 is about 405.0406320053.

Adding to 66450121 its reverse (12105466), we get a palindrome (78555587).

The spelling of 66450121 in words is "sixty-six million, four hundred fifty thousand, one hundred twenty-one".