256455755500644 has 36 divisors (see below), whose sum is σ = 740872182558144. Its totient is φ = 73273073000112.

The previous prime is 256455755500561. The next prime is 256455755500667. The reversal of 256455755500644 is 446005557554652.

256455755500644 is a `hidden beast` number, since 2 + 5 + 6 + 4 + 5 + 5 + 75 + 550 + 0 + 6 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 508840784472 + ... + 508840784975.

Almost surely, 2^{256455755500644} is an apocalyptic number.

It is an amenable number.

256455755500644 is an abundant number, since it is smaller than the sum of its proper divisors (484416427057500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256455755500644 is a wasteful number, since it uses less digits than its factorization.

256455755500644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017681569464 (or 1017681569459 counting only the distinct ones).

The product of its (nonzero) digits is 504000000, while the sum is 63.

The spelling of 256455755500644 in words is "two hundred fifty-six trillion, four hundred fifty-five billion, seven hundred fifty-five million, five hundred thousand, six hundred forty-four".