66455513 has 4 divisors (see below), whose sum is σ = 66720528. Its totient is φ = 66190500.

The previous prime is 66455507. The next prime is 66455531. The reversal of 66455513 is 31555466.

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 66455513 - 2⁶ = 66455449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66455713) 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, 132131 + ... + 132632.

It is an arithmetic number, because the mean of its divisors is an integer number (16680132).

Almost surely, 2^66455513 is an apocalyptic number.

It is an amenable number.

66455513 is a deficient number, since it is larger than the sum of its proper divisors (265015).

66455513 is a wasteful number, since it uses less digits than its factorization.

66455513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265014.

The product of its digits is 54000, while the sum is 35.

The square root of 66455513 is about 8152.0250858299. The cubic root of 66455513 is about 405.0515871899.

The spelling of 66455513 in words is "sixty-six million, four hundred fifty-five thousand, five hundred thirteen".