66018451 has 2 divisors, whose sum is σ = 66018452. Its totient is φ = 66018450.

The previous prime is 66018377. The next prime is 66018457. The reversal of 66018451 is 15481066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66018451 - 2¹⁵ = 65985683 is a prime.

It is not a weakly prime, because it can be changed into another prime (66018457) 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 as a sum of consecutive naturals, namely, 33009225 + 33009226.

It is an arithmetic number, because the mean of its divisors is an integer number (33009226).

Almost surely, 2^66018451 is an apocalyptic number.

66018451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66018451 is an equidigital number, since it uses as much as digits as its factorization.

66018451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 66018451 is about 8125.1739058312. The cubic root of 66018451 is about 404.1616576037.

The spelling of 66018451 in words is "sixty-six million, eighteen thousand, four hundred fifty-one".