256506443315054 has 4 divisors (see below), whose sum is σ = 384759664972584. Its totient is φ = 128253221657526.

The previous prime is 256506443315053. The next prime is 256506443315107. The reversal of 256506443315054 is 450513344605652.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256506443314987 and 256506443315005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256506443315053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64126610828762 + ... + 64126610828765.

It is an arithmetic number, because the mean of its divisors is an integer number (96189916243146).

Almost surely, 2^{256506443315054} is an apocalyptic number.

256506443315054 is a deficient number, since it is larger than the sum of its proper divisors (128253221657530).

256506443315054 is a wasteful number, since it uses less digits than its factorization.

256506443315054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128253221657529.

The product of its (nonzero) digits is 25920000, while the sum is 53.

The spelling of 256506443315054 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred forty-three million, three hundred fifteen thousand, fifty-four".