1287663570105 has 32 divisors (see below), whose sum is σ = 2247916745088. Its totient is φ = 624222144000.

The previous prime is 1287663570101. The next prime is 1287663570163. The reversal of 1287663570105 is 5010753667821.

It is not a de Polignac number, because 1287663570105 - 2² = 1287663570101 is a prime.

It is a super-2 number, since 2×1287663570105² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287663570101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420397 + ... + 1658933.

It is an arithmetic number, because the mean of its divisors is an integer number (70247398284).

Almost surely, 2^{1287663570105} is an apocalyptic number.

1287663570105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287663570105 is a deficient number, since it is larger than the sum of its proper divisors (960253174983).

1287663570105 is a wasteful number, since it uses less digits than its factorization.

1287663570105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244857.

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

The spelling of 1287663570105 in words is "one trillion, two hundred eighty-seven billion, six hundred sixty-three million, five hundred seventy thousand, one hundred five".