1316543778 has 48 divisors (see below), whose sum is σ = 3117194496. Its totient is φ = 398265120.

The previous prime is 1316543749. The next prime is 1316543779. The reversal of 1316543778 is 8773456131.

1316543778 is a `hidden beast` number, since 1 + 31 + 6 + 543 + 7 + 78 = 666.

1316543778 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1316543779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115951 + ... + 126797.

It is an arithmetic number, because the mean of its divisors is an integer number (64941552).

Almost surely, 2^1316543778 is an apocalyptic number.

1316543778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1316543778 is an abundant number, since it is smaller than the sum of its proper divisors (1800650718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1316543778 is a wasteful number, since it uses less digits than its factorization.

1316543778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11479 (or 11476 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 1316543778 is about 36284.2083832623. The cubic root of 1316543778 is about 1096.0030641087.

The spelling of 1316543778 in words is "one billion, three hundred sixteen million, five hundred forty-three thousand, seven hundred seventy-eight".