1287293661611 has 4 divisors (see below), whose sum is σ = 1306506999912. Its totient is φ = 1268080323312.

The previous prime is 1287293661569. The next prime is 1287293661629. The reversal of 1287293661611 is 1161663927821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287293661611 - 2³⁴ = 1270113792427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287293661671) 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 3 ways as a sum of consecutive naturals, for example, 9606669050 + ... + 9606669183.

It is an arithmetic number, because the mean of its divisors is an integer number (326626749978).

Almost surely, 2^{1287293661611} is an apocalyptic number.

1287293661611 is a deficient number, since it is larger than the sum of its proper divisors (19213338301).

1287293661611 is an equidigital number, since it uses as much as digits as its factorization.

1287293661611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19213338300.

The product of its digits is 1306368, while the sum is 53.

The spelling of 1287293661611 in words is "one trillion, two hundred eighty-seven billion, two hundred ninety-three million, six hundred sixty-one thousand, six hundred eleven".