1272075505817 has 4 divisors (see below), whose sum is σ = 1272078902580. Its totient is φ = 1272072109056.

The previous prime is 1272075505783. The next prime is 1272075505819. The reversal of 1272075505817 is 7185055702721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172074725376 + 100000780441 = 1082624^2 + 316229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272075505817 - 2²⁴ = 1272058728601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272075505819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055528 + ... + 1912665.

It is an arithmetic number, because the mean of its divisors is an integer number (318019725645).

Almost surely, 2^{1272075505817} is an apocalyptic number.

It is an amenable number.

1272075505817 is a deficient number, since it is larger than the sum of its proper divisors (3396763).

1272075505817 is an equidigital number, since it uses as much as digits as its factorization.

1272075505817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3396762.

The product of its (nonzero) digits is 1372000, while the sum is 50.

The spelling of 1272075505817 in words is "one trillion, two hundred seventy-two billion, seventy-five million, five hundred five thousand, eight hundred seventeen".