166495434778 has 8 divisors (see below), whose sum is σ = 249745255668. Its totient is φ = 83247016224.

The previous prime is 166495434697. The next prime is 166495434779. The reversal of 166495434778 is 877434594661.

166495434778 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148350536569 + 18144898209 = 385163^2 + 134703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166495434779) 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 in 3 ways as a sum of consecutive naturals, for example, 28000 + ... + 577732.

Almost surely, 2^166495434778 is an apocalyptic number.

166495434778 is a deficient number, since it is larger than the sum of its proper divisors (83249820890).

166495434778 is a wasteful number, since it uses less digits than its factorization.

166495434778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701168.

The product of its digits is 121927680, while the sum is 64.

The spelling of 166495434778 in words is "one hundred sixty-six billion, four hundred ninety-five million, four hundred thirty-four thousand, seven hundred seventy-eight".