66975451 has 2 divisors, whose sum is σ = 66975452. Its totient is φ = 66975450.

The previous prime is 66975449. The next prime is 66975457. The reversal of 66975451 is 15457966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66975451 - 2¹ = 66975449 is a prime.

It is a super-2 number, since 2×66975451² = 8971422073306802, which contains 22 as substring.

Together with 66975449, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66975398 and 66975407.

It is not a weakly prime, because it can be changed into another prime (66975457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33487725 + 33487726.

It is an arithmetic number, because the mean of its divisors is an integer number (33487726).

Almost surely, 2^66975451 is an apocalyptic number.

66975451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66975451 is an equidigital number, since it uses as much as digits as its factorization.

66975451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 66975451 is about 8183.8530656409. The cubic root of 66975451 is about 406.1051985399.

The spelling of 66975451 in words is "sixty-six million, nine hundred seventy-five thousand, four hundred fifty-one".