66457451 has 4 divisors (see below), whose sum is σ = 66525504. Its totient is φ = 66389400.

The previous prime is 66457441. The next prime is 66457453. The reversal of 66457451 is 15475466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15475466 = 2 ⋅7737733.

It is a cyclic number.

It is not a de Polignac number, because 66457451 - 2⁶ = 66457387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66457453) 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, 32540 + ... + 34521.

It is an arithmetic number, because the mean of its divisors is an integer number (16631376).

Almost surely, 2^66457451 is an apocalyptic number.

66457451 is a deficient number, since it is larger than the sum of its proper divisors (68053).

66457451 is an equidigital number, since it uses as much as digits as its factorization.

66457451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68052.

The product of its digits is 100800, while the sum is 38.

The square root of 66457451 is about 8152.1439511333. The cubic root of 66457451 is about 405.0555245725.

The spelling of 66457451 in words is "sixty-six million, four hundred fifty-seven thousand, four hundred fifty-one".