256661303046305 has 8 divisors (see below), whose sum is σ = 307994424095232. Its totient is φ = 205328468810608.

The previous prime is 256661303046271. The next prime is 256661303046349. The reversal of 256661303046305 is 503640303166652.

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 256661303046305 - 2¹⁶ = 256661302980769 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, 69729647 + ... + 73318116.

It is an arithmetic number, because the mean of its divisors is an integer number (38499303011904).

Almost surely, 2^{256661303046305} is an apocalyptic number.

It is an amenable number.

256661303046305 is a deficient number, since it is larger than the sum of its proper divisors (51333121048927).

256661303046305 is a wasteful number, since it uses less digits than its factorization.

256661303046305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143406615.

The product of its (nonzero) digits is 6998400, while the sum is 50.

The spelling of 256661303046305 in words is "two hundred fifty-six trillion, six hundred sixty-one billion, three hundred three million, forty-six thousand, three hundred five".