256310128633 has 16 divisors (see below), whose sum is σ = 277652551680. Its totient is φ = 235203845184.

The previous prime is 256310128631. The next prime is 256310128693. The reversal of 256310128633 is 336821013652.

It is a cyclic number.

It is not a de Polignac number, because 256310128633 - 2¹ = 256310128631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256310128631) 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, 1539960 + ... + 1698262.

It is an arithmetic number, because the mean of its divisors is an integer number (17353284480).

Almost surely, 2^256310128633 is an apocalyptic number.

It is an amenable number.

256310128633 is a deficient number, since it is larger than the sum of its proper divisors (21342423047).

256310128633 is a wasteful number, since it uses less digits than its factorization.

256310128633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159048.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 256310128633 in words is "two hundred fifty-six billion, three hundred ten million, one hundred twenty-eight thousand, six hundred thirty-three".