856394949493658 has 8 divisors (see below), whose sum is σ = 1284630276610452. Its totient is φ = 428184857290176.

The previous prime is 856394949493571. The next prime is 856394949493667.

856394949493658 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 747318293917129 + 109076655576529 = 27337123^2 + 10443977^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 6308643485 + ... + 6308779232.

Almost surely, 2^{856394949493658} is an apocalyptic number.

856394949493658 is a deficient number, since it is larger than the sum of its proper divisors (428235327116794).

856394949493658 is a wasteful number, since it uses less digits than its factorization.

856394949493658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12617456656.

The product of its digits is 217678233600, while the sum is 92.

The spelling of 856394949493658 in words is "eight hundred fifty-six trillion, three hundred ninety-four billion, nine hundred forty-nine million, four hundred ninety-three thousand, six hundred fifty-eight".