256434243501 has 16 divisors (see below), whose sum is σ = 352996323840. Its totient is φ = 165415868160.

The previous prime is 256434243487. The next prime is 256434243503. The reversal of 256434243501 is 105342434652.

It is not a de Polignac number, because 256434243501 - 2⁵ = 256434243469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256434243501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256434243503) 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, 401041 + ... + 820793.

It is an arithmetic number, because the mean of its divisors is an integer number (22062270240).

Almost surely, 2^256434243501 is an apocalyptic number.

It is an amenable number.

256434243501 is a deficient number, since it is larger than the sum of its proper divisors (96562080339).

256434243501 is a wasteful number, since it uses less digits than its factorization.

256434243501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426356.

The product of its (nonzero) digits is 345600, while the sum is 39.

The spelling of 256434243501 in words is "two hundred fifty-six billion, four hundred thirty-four million, two hundred forty-three thousand, five hundred one".