66704047 has 2 divisors, whose sum is σ = 66704048. Its totient is φ = 66704046.

The previous prime is 66703999. The next prime is 66704101. The reversal of 66704047 is 74040766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66704047 - 2⁷ = 66703919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66705047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33352023 + 33352024.

It is an arithmetic number, because the mean of its divisors is an integer number (33352024).

Almost surely, 2^66704047 is an apocalyptic number.

66704047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66704047 is an equidigital number, since it uses as much as digits as its factorization.

66704047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66704047 is about 8167.2545570712. The cubic root of 66704047 is about 405.5559037910. Note that the first 3 decimals are identical.

The spelling of 66704047 in words is "sixty-six million, seven hundred four thousand, forty-seven".