66043451 has 2 divisors, whose sum is σ = 66043452. Its totient is φ = 66043450.

The previous prime is 66043391. The next prime is 66043477. The reversal of 66043451 is 15434066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66043451 - 2¹⁴ = 66027067 is a prime.

It is not a weakly prime, because it can be changed into another prime (66043751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33021725 + 33021726.

It is an arithmetic number, because the mean of its divisors is an integer number (33021726).

Almost surely, 2^66043451 is an apocalyptic number.

66043451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66043451 is an equidigital number, since it uses as much as digits as its factorization.

66043451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66043451 is about 8126.7121888252. The cubic root of 66043451 is about 404.2126674156.

The spelling of 66043451 in words is "sixty-six million, forty-three thousand, four hundred fifty-one".