66451313 has 4 divisors (see below), whose sum is σ = 66929520. Its totient is φ = 65973108.

The previous prime is 66451309. The next prime is 66451361. The reversal of 66451313 is 31315466.

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 66451313 - 2² = 66451309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66451013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238895 + ... + 239172.

It is an arithmetic number, because the mean of its divisors is an integer number (16732380).

Almost surely, 2^66451313 is an apocalyptic number.

It is an amenable number.

66451313 is a deficient number, since it is larger than the sum of its proper divisors (478207).

66451313 is a wasteful number, since it uses less digits than its factorization.

66451313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478206.

The product of its digits is 6480, while the sum is 29.

The square root of 66451313 is about 8151.7674770567. The cubic root of 66451313 is about 405.0430538998.

Adding to 66451313 its reverse (31315466), we get a palindrome (97766779).

The spelling of 66451313 in words is "sixty-six million, four hundred fifty-one thousand, three hundred thirteen".