256631143155513 has 16 divisors (see below), whose sum is σ = 391076293104000. Its totient is φ = 146639125120896.

The previous prime is 256631143155509. The next prime is 256631143155547. The reversal of 256631143155513 is 315551341136652.

It is not a de Polignac number, because 256631143155513 - 2² = 256631143155509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256631143145513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301331170 + ... + 302181627.

It is an arithmetic number, because the mean of its divisors is an integer number (24442268319000).

Almost surely, 2^{256631143155513} is an apocalyptic number.

It is an amenable number.

256631143155513 is a deficient number, since it is larger than the sum of its proper divisors (134445149948487).

256631143155513 is a wasteful number, since it uses less digits than its factorization.

256631143155513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603533056.

The product of its digits is 4860000, while the sum is 51.

The spelling of 256631143155513 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, one hundred forty-three million, one hundred fifty-five thousand, five hundred thirteen".