1256255045505 has 24 divisors (see below), whose sum is σ = 2188562104872. Its totient is φ = 666601657344.

The previous prime is 1256255045491. The next prime is 1256255045519. The reversal of 1256255045505 is 5055405526521.

1256255045505 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 2 + 550 + 45 + 50 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1256255045491) and next prime (1256255045519).

It can be written as a sum of positive squares in 4 ways, for example, as 78708863601 + 1177546181904 = 280551^2 + 1085148^2 .

It is not a de Polignac number, because 1256255045505 - 2¹¹ = 1256255043457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70845904 + ... + 70863633.

It is an arithmetic number, because the mean of its divisors is an integer number (91190087703).

Almost surely, 2^{1256255045505} is an apocalyptic number.

1256255045505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256255045505 is a deficient number, since it is larger than the sum of its proper divisors (932307059367).

1256255045505 is a wasteful number, since it uses less digits than its factorization.

1256255045505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141709745 (or 141709742 counting only the distinct ones).

The product of its (nonzero) digits is 1500000, while the sum is 45.

The spelling of 1256255045505 in words is "one trillion, two hundred fifty-six billion, two hundred fifty-five million, forty-five thousand, five hundred five".