166785776363 has 2 divisors, whose sum is σ = 166785776364. Its totient is φ = 166785776362.

The previous prime is 166785776341. The next prime is 166785776393. The reversal of 166785776363 is 363677587661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166785776363 is a prime.

It is a super-3 number, since 3×166785776363³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166785776363.

It is not a weakly prime, because it can be changed into another prime (166785776393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83392888181 + 83392888182.

It is an arithmetic number, because the mean of its divisors is an integer number (83392888182).

Almost surely, 2^166785776363 is an apocalyptic number.

166785776363 is a deficient number, since it is larger than the sum of its proper divisors (1).

166785776363 is an equidigital number, since it uses as much as digits as its factorization.

166785776363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160030080, while the sum is 65.

The spelling of 166785776363 in words is "one hundred sixty-six billion, seven hundred eighty-five million, seven hundred seventy-six thousand, three hundred sixty-three".