66846407 has 2 divisors, whose sum is σ = 66846408. Its totient is φ = 66846406.

The previous prime is 66846391. The next prime is 66846419. The reversal of 66846407 is 70464866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66846407 - 2⁴ = 66846391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66846497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33423203 + 33423204.

It is an arithmetic number, because the mean of its divisors is an integer number (33423204).

Almost surely, 2^66846407 is an apocalyptic number.

66846407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66846407 is an equidigital number, since it uses as much as digits as its factorization.

66846407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 66846407 is about 8175.9652029592. The cubic root of 66846407 is about 405.8442117073.

The spelling of 66846407 in words is "sixty-six million, eight hundred forty-six thousand, four hundred seven".