256645486205 has 32 divisors (see below), whose sum is σ = 323778470400. Its totient is φ = 195106060800.

The previous prime is 256645486193. The next prime is 256645486217. The reversal of 256645486205 is 502684546652.

It is an interprime number because it is at equal distance from previous prime (256645486193) and next prime (256645486217).

It is not a de Polignac number, because 256645486205 - 2⁸ = 256645485949 is a prime.

It is a super-3 number, since 3×256645486205³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1221020 + ... + 1415690.

It is an arithmetic number, because the mean of its divisors is an integer number (10118077200).

Almost surely, 2^256645486205 is an apocalyptic number.

It is an amenable number.

256645486205 is a deficient number, since it is larger than the sum of its proper divisors (67132984195).

256645486205 is a wasteful number, since it uses less digits than its factorization.

256645486205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194885.

The product of its (nonzero) digits is 13824000, while the sum is 53.

The spelling of 256645486205 in words is "two hundred fifty-six billion, six hundred forty-five million, four hundred eighty-six thousand, two hundred five".