1266655246426 has 4 divisors (see below), whose sum is σ = 1899982869642. Its totient is φ = 633327623212.

The previous prime is 1266655246387. The next prime is 1266655246427. The reversal of 1266655246426 is 6246425566621.

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

It can be written as a sum of positive squares in only one way, i.e., 804248446401 + 462406800025 = 896799^2 + 680005^2 .

It is not an unprimeable number, because it can be changed into a prime (1266655246427) 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 as a sum of consecutive naturals, namely, 316663811605 + ... + 316663811608.

Almost surely, 2^{1266655246426} is an apocalyptic number.

1266655246426 is a deficient number, since it is larger than the sum of its proper divisors (633327623216).

1266655246426 is an equidigital number, since it uses as much as digits as its factorization.

1266655246426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633327623215.

The product of its digits is 24883200, while the sum is 55.

The spelling of 1266655246426 in words is "one trillion, two hundred sixty-six billion, six hundred fifty-five million, two hundred forty-six thousand, four hundred twenty-six".