66461321 has 4 divisors (see below), whose sum is σ = 66939600. Its totient is φ = 65983044.

The previous prime is 66461281. The next prime is 66461327. The reversal of 66461321 is 12316466.

It is a happy number.

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 66461321 - 2²² = 62267017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66461327) 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, 238931 + ... + 239208.

It is an arithmetic number, because the mean of its divisors is an integer number (16734900).

Almost surely, 2^66461321 is an apocalyptic number.

It is an amenable number.

66461321 is a deficient number, since it is larger than the sum of its proper divisors (478279).

66461321 is a wasteful number, since it uses less digits than its factorization.

66461321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478278.

The product of its digits is 5184, while the sum is 29.

The square root of 66461321 is about 8152.3813085503. The cubic root of 66461321 is about 405.0633869187.

Adding to 66461321 its reverse (12316466), we get a palindrome (78777787).

The spelling of 66461321 in words is "sixty-six million, four hundred sixty-one thousand, three hundred twenty-one".