66513451 has 4 divisors (see below), whose sum is σ = 66960000. Its totient is φ = 66066904.

The previous prime is 66513373. The next prime is 66513479. The reversal of 66513451 is 15431566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66513451 - 2⁷ = 66513323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66513481) 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, 223051 + ... + 223348.

It is an arithmetic number, because the mean of its divisors is an integer number (16740000).

Almost surely, 2^66513451 is an apocalyptic number.

66513451 is a deficient number, since it is larger than the sum of its proper divisors (446549).

66513451 is a wasteful number, since it uses less digits than its factorization.

66513451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446548.

The product of its digits is 10800, while the sum is 31.

The square root of 66513451 is about 8155.5779071749. The cubic root of 66513451 is about 405.1692652228.

The spelling of 66513451 in words is "sixty-six million, five hundred thirteen thousand, four hundred fifty-one".