1266386312641 has 4 divisors (see below), whose sum is σ = 1267605164800. Its totient is φ = 1265167460484.

The previous prime is 1266386312579. The next prime is 1266386312693. The reversal of 1266386312641 is 1462136836621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266386312641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266386313641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609424521 + ... + 609426598.

It is an arithmetic number, because the mean of its divisors is an integer number (316901291200).

Almost surely, 2^{1266386312641} is an apocalyptic number.

It is an amenable number.

1266386312641 is a deficient number, since it is larger than the sum of its proper divisors (1218852159).

1266386312641 is a wasteful number, since it uses less digits than its factorization.

1266386312641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218852158.

The product of its digits is 1492992, while the sum is 49.

The spelling of 1266386312641 in words is "one trillion, two hundred sixty-six billion, three hundred eighty-six million, three hundred twelve thousand, six hundred forty-one".