256411653505 has 8 divisors (see below), whose sum is σ = 351650267712. Its totient is φ = 175825133808.

The previous prime is 256411653499. The next prime is 256411653523. The reversal of 256411653505 is 505356114652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256411653505 - 2⁹ = 256411652993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3663023587 + ... + 3663023656.

It is an arithmetic number, because the mean of its divisors is an integer number (43956283464).

Almost surely, 2^256411653505 is an apocalyptic number.

It is an amenable number.

256411653505 is a deficient number, since it is larger than the sum of its proper divisors (95238614207).

256411653505 is an equidigital number, since it uses as much as digits as its factorization.

256411653505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7326047255.

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 256411653505 in words is "two hundred fifty-six billion, four hundred eleven million, six hundred fifty-three thousand, five hundred five".