66513413 has 4 divisors (see below), whose sum is σ = 67928640. Its totient is φ = 65098188.

The previous prime is 66513373. The next prime is 66513479. The reversal of 66513413 is 31431566.

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 a de Polignac number, because none of the positive numbers 2^k-66513413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66513113) 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, 707543 + ... + 707636.

It is an arithmetic number, because the mean of its divisors is an integer number (16982160).

Almost surely, 2^66513413 is an apocalyptic number.

It is an amenable number.

66513413 is a deficient number, since it is larger than the sum of its proper divisors (1415227).

66513413 is a wasteful number, since it uses less digits than its factorization.

66513413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415226.

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

The square root of 66513413 is about 8155.5755774807. The cubic root of 66513413 is about 405.1691880633.

Adding to 66513413 its reverse (31431566), we get a palindrome (97944979).

The spelling of 66513413 in words is "sixty-six million, five hundred thirteen thousand, four hundred thirteen".