66885407 has 2 divisors, whose sum is σ = 66885408. Its totient is φ = 66885406.

The previous prime is 66885373. The next prime is 66885437. The reversal of 66885407 is 70458866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66885407 - 2⁸ = 66885151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66885437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33442703 + 33442704.

It is an arithmetic number, because the mean of its divisors is an integer number (33442704).

Almost surely, 2^66885407 is an apocalyptic number.

66885407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66885407 is an equidigital number, since it uses as much as digits as its factorization.

66885407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66885407 is about 8178.3498946915. The cubic root of 66885407 is about 405.9231231892.

The spelling of 66885407 in words is "sixty-six million, eight hundred eighty-five thousand, four hundred seven".