256623245537434 has 4 divisors (see below), whose sum is σ = 384934868306154. Its totient is φ = 128311622768716.

The previous prime is 256623245537383. The next prime is 256623245537539. The reversal of 256623245537434 is 434735542326652.

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., 240690494725209 + 15932750812225 = 15514203^2 + 3991585^2 .

It is a super-2 number, since 2×256623245537434² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64155811384357 + ... + 64155811384360.

Almost surely, 2^{256623245537434} is an apocalyptic number.

256623245537434 is a deficient number, since it is larger than the sum of its proper divisors (128311622768720).

256623245537434 is a wasteful number, since it uses less digits than its factorization.

256623245537434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128311622768719.

The product of its digits is 435456000, while the sum is 61.

The spelling of 256623245537434 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, two hundred forty-five million, five hundred thirty-seven thousand, four hundred thirty-four".