1287795220305 has 96 divisors (see below), whose sum is σ = 2365120622592. Its totient is φ = 596775020160.

The previous prime is 1287795220303. The next prime is 1287795220367. The reversal of 1287795220305 is 5030225977821.

It is not a de Polignac number, because 1287795220305 - 2¹ = 1287795220303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287795220303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 57054132 + ... + 57076698.

It is an arithmetic number, because the mean of its divisors is an integer number (24636673152).

Almost surely, 2^{1287795220305} is an apocalyptic number.

1287795220305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287795220305 is a deficient number, since it is larger than the sum of its proper divisors (1077325402287).

1287795220305 is a wasteful number, since it uses less digits than its factorization.

1287795220305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23987 (or 23976 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 1287795220305 in words is "one trillion, two hundred eighty-seven billion, seven hundred ninety-five million, two hundred twenty thousand, three hundred five".