256671315674 has 4 divisors (see below), whose sum is σ = 385006973514. Its totient is φ = 128335657836.

The previous prime is 256671315673. The next prime is 256671315709. The reversal of 256671315674 is 476513176652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 192918600625 + 63752715049 = 439225^2 + 252493^2 .

It is not an unprimeable number, because it can be changed into a prime (256671315671) 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, 64167828917 + ... + 64167828920.

Almost surely, 2^256671315674 is an apocalyptic number.

256671315674 is a deficient number, since it is larger than the sum of its proper divisors (128335657840).

256671315674 is a wasteful number, since it uses less digits than its factorization.

256671315674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128335657839.

The product of its digits is 6350400, while the sum is 53.

The spelling of 256671315674 in words is "two hundred fifty-six billion, six hundred seventy-one million, three hundred fifteen thousand, six hundred seventy-four".