256611467210531 has 4 divisors (see below), whose sum is σ = 256620788734200. Its totient is φ = 256602145686864.

The previous prime is 256611467210473. The next prime is 256611467210537. The reversal of 256611467210531 is 135012764116652.

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

It is a cyclic number.

It is not a de Polignac number, because 256611467210531 - 2¹⁰ = 256611467209507 is a prime.

It is a super-2 number, since 2×256611467210531² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256611467210531.

It is not an unprimeable number, because it can be changed into a prime (256611467210537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4660720541 + ... + 4660775598.

It is an arithmetic number, because the mean of its divisors is an integer number (64155197183550).

Almost surely, 2^{256611467210531} is an apocalyptic number.

256611467210531 is a deficient number, since it is larger than the sum of its proper divisors (9321523669).

256611467210531 is an equidigital number, since it uses as much as digits as its factorization.

256611467210531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9321523668.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 256611467210531 in words is "two hundred fifty-six trillion, six hundred eleven billion, four hundred sixty-seven million, two hundred ten thousand, five hundred thirty-one".