1311102061778 has 4 divisors (see below), whose sum is σ = 1966653092670. Its totient is φ = 655551030888.

The previous prime is 1311102061777. The next prime is 1311102061861. The reversal of 1311102061778 is 8771602011131.

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., 1151751800809 + 159350260969 = 1073197^2 + 399187^2 .

It is not an unprimeable number, because it can be changed into a prime (1311102061771) 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, 327775515443 + ... + 327775515446.

Almost surely, 2^{1311102061778} is an apocalyptic number.

1311102061778 is a deficient number, since it is larger than the sum of its proper divisors (655551030892).

1311102061778 is an equidigital number, since it uses as much as digits as its factorization.

1311102061778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655551030891.

The product of its (nonzero) digits is 14112, while the sum is 38.

The spelling of 1311102061778 in words is "one trillion, three hundred eleven billion, one hundred two million, sixty-one thousand, seven hundred seventy-eight".