166626278783 has 2 divisors, whose sum is σ = 166626278784. Its totient is φ = 166626278782.

The previous prime is 166626278759. The next prime is 166626278827. The reversal of 166626278783 is 387872626661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166626278783 - 2¹⁰ = 166626277759 is a prime.

It is a super-2 number, since 2×166626278783² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166626178783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83313139391 + 83313139392.

It is an arithmetic number, because the mean of its divisors is an integer number (83313139392).

Almost surely, 2^166626278783 is an apocalyptic number.

166626278783 is a deficient number, since it is larger than the sum of its proper divisors (1).

166626278783 is an equidigital number, since it uses as much as digits as its factorization.

166626278783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48771072, while the sum is 62.

The spelling of 166626278783 in words is "one hundred sixty-six billion, six hundred twenty-six million, two hundred seventy-eight thousand, seven hundred eighty-three".