66042451 has 2 divisors, whose sum is σ = 66042452. Its totient is φ = 66042450.

The previous prime is 66042421. The next prime is 66042463. The reversal of 66042451 is 15424066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66042451 - 2⁵ = 66042419 is a prime.

It is not a weakly prime, because it can be changed into another prime (66042401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33021225 + 33021226.

It is an arithmetic number, because the mean of its divisors is an integer number (33021226).

Almost surely, 2^66042451 is an apocalyptic number.

66042451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66042451 is an equidigital number, since it uses as much as digits as its factorization.

66042451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 66042451 is about 8126.6506630961. The cubic root of 66042451 is about 404.2106272704.

The spelling of 66042451 in words is "sixty-six million, forty-two thousand, four hundred fifty-one".