1284916260861 has 16 divisors (see below), whose sum is σ = 1916186139520. Its totient is φ = 850937918400.

The previous prime is 1284916260853. The next prime is 1284916260889. The reversal of 1284916260861 is 1680626194821.

1284916260861 is a `hidden beast` number, since 1 + 2 + 8 + 4 + 9 + 1 + 626 + 0 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 1284916260861 - 2³ = 1284916260853 is a prime.

It is a super-2 number, since 2×1284916260861² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1284916260798 and 1284916260807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284916260841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157577020 + ... + 157585173.

It is an arithmetic number, because the mean of its divisors is an integer number (119761633720).

Almost surely, 2^{1284916260861} is an apocalyptic number.

It is an amenable number.

1284916260861 is a deficient number, since it is larger than the sum of its proper divisors (631269878659).

1284916260861 is a wasteful number, since it uses less digits than its factorization.

1284916260861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315162353 (or 315162347 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 1284916260861 in words is "one trillion, two hundred eighty-four billion, nine hundred sixteen million, two hundred sixty thousand, eight hundred sixty-one".