256916322154 has 4 divisors (see below), whose sum is σ = 385374483234. Its totient is φ = 128458161076.

The previous prime is 256916322151. The next prime is 256916322163. The reversal of 256916322154 is 451223619652.

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., 203865795225 + 53050526929 = 451515^2 + 230327^2 .

It is a super-2 number, since 2×256916322154² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256916322151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64229080537 + ... + 64229080540.

Almost surely, 2^256916322154 is an apocalyptic number.

256916322154 is a deficient number, since it is larger than the sum of its proper divisors (128458161080).

256916322154 is a wasteful number, since it uses less digits than its factorization.

256916322154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128458161079.

The product of its digits is 777600, while the sum is 46.

The spelling of 256916322154 in words is "two hundred fifty-six billion, nine hundred sixteen million, three hundred twenty-two thousand, one hundred fifty-four".