1266615027987 has 8 divisors (see below), whose sum is σ = 1688855225280. Its totient is φ = 844392424680.

The previous prime is 1266615027893. The next prime is 1266615027989. The reversal of 1266615027987 is 7897205166621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266615027987 - 2³² = 1262320060691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1266615027987.

It is not an unprimeable number, because it can be changed into a prime (1266615027989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4229589 + ... + 4519142.

It is an arithmetic number, because the mean of its divisors is an integer number (211106903160).

Almost surely, 2^{1266615027987} is an apocalyptic number.

1266615027987 is a deficient number, since it is larger than the sum of its proper divisors (422240197293).

1266615027987 is an equidigital number, since it uses as much as digits as its factorization.

1266615027987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8796993.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 1266615027987 in words is "one trillion, two hundred sixty-six billion, six hundred fifteen million, twenty-seven thousand, nine hundred eighty-seven".