166558308172783 has 2 divisors, whose sum is σ = 166558308172784. Its totient is φ = 166558308172782.

The previous prime is 166558308172769. The next prime is 166558308172973. The reversal of 166558308172783 is 387271803855661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166558308172783 - 2¹⁷ = 166558308041711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166558308172733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83279154086391 + 83279154086392.

It is an arithmetic number, because the mean of its divisors is an integer number (83279154086392).

Almost surely, 2^{166558308172783} is an apocalyptic number.

166558308172783 is a deficient number, since it is larger than the sum of its proper divisors (1).

166558308172783 is an equidigital number, since it uses as much as digits as its factorization.

166558308172783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 406425600, while the sum is 70.

The spelling of 166558308172783 in words is "one hundred sixty-six trillion, five hundred fifty-eight billion, three hundred eight million, one hundred seventy-two thousand, seven hundred eighty-three".