66749783 has 2 divisors, whose sum is σ = 66749784. Its totient is φ = 66749782.

The previous prime is 66749759. The next prime is 66749807. The reversal of 66749783 is 38794766.

It is a balanced prime because it is at equal distance from previous prime (66749759) and next prime (66749807).

It is a cyclic number.

It is not a de Polignac number, because 66749783 - 2¹⁴ = 66733399 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 (66749713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33374891 + 33374892.

It is an arithmetic number, because the mean of its divisors is an integer number (33374892).

Almost surely, 2^66749783 is an apocalyptic number.

66749783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66749783 is an equidigital number, since it uses as much as digits as its factorization.

66749783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The square root of 66749783 is about 8170.0540389890. The cubic root of 66749783 is about 405.6485731665.

The spelling of 66749783 in words is "sixty-six million, seven hundred forty-nine thousand, seven hundred eighty-three".