66696451 has 2 divisors, whose sum is σ = 66696452. Its totient is φ = 66696450.

The previous prime is 66696367. The next prime is 66696493. The reversal of 66696451 is 15469666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66696451 - 2¹⁹ = 66172163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66696398 and 66696407.

It is not a weakly prime, because it can be changed into another prime (66696551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33348225 + 33348226.

It is an arithmetic number, because the mean of its divisors is an integer number (33348226).

Almost surely, 2^66696451 is an apocalyptic number.

66696451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66696451 is an equidigital number, since it uses as much as digits as its factorization.

66696451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 66696451 is about 8166.7895160828. The cubic root of 66696451 is about 405.5405088251.

The spelling of 66696451 in words is "sixty-six million, six hundred ninety-six thousand, four hundred fifty-one".