166540783 has 2 divisors, whose sum is σ = 166540784. Its totient is φ = 166540782.

The previous prime is 166540771. The next prime is 166540793. The reversal of 166540783 is 387045661.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (387045661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166540783 - 2¹³ = 166532591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166540753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83270391 + 83270392.

It is an arithmetic number, because the mean of its divisors is an integer number (83270392).

Almost surely, 2^166540783 is an apocalyptic number.

166540783 is a deficient number, since it is larger than the sum of its proper divisors (1).

166540783 is an equidigital number, since it uses as much as digits as its factorization.

166540783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 166540783 is about 12905.0681129547. The cubic root of 166540783 is about 550.1826203483.

The spelling of 166540783 in words is "one hundred sixty-six million, five hundred forty thousand, seven hundred eighty-three".