1280651279985 has 96 divisors (see below), whose sum is σ = 2862969857280. Its totient is φ = 513866304000.

The previous prime is 1280651279983. The next prime is 1280651280023. The reversal of 1280651279985 is 5899721560821.

1280651279985 is a `hidden beast` number, since 1 + 28 + 0 + 6 + 512 + 7 + 9 + 98 + 5 = 666.

It is not a de Polignac number, because 1280651279985 - 2¹ = 1280651279983 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1280651279983) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6271866 + ... + 6472835.

It is an arithmetic number, because the mean of its divisors is an integer number (29822602680).

Almost surely, 2^{1280651279985} is an apocalyptic number.

1280651279985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280651279985 is an abundant number, since it is smaller than the sum of its proper divisors (1582318577295).

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

1280651279985 is a wasteful number, since it uses less digits than its factorization.

1280651279985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744759 (or 12744756 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 63.

The spelling of 1280651279985 in words is "one trillion, two hundred eighty billion, six hundred fifty-one million, two hundred seventy-nine thousand, nine hundred eighty-five".