1306263009978 has 24 divisors (see below), whose sum is σ = 2831653843668. Its totient is φ = 435202953792.

The previous prime is 1306263009977. The next prime is 1306263010009. The reversal of 1306263009978 is 8799003626031.

1306263009978 is a `hidden beast` number, since 1 + 3 + 0 + 626 + 3 + 0 + 0 + 9 + 9 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1299798367569 + 6464642409 = 1140087^2 + 80403^2 .

It is not an unprimeable number, because it can be changed into a prime (1306263009977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18133851 + ... + 18205742.

Almost surely, 2^{1306263009978} is an apocalyptic number.

1306263009978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1306263009978 is an abundant number, since it is smaller than the sum of its proper divisors (1525390833690).

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

1306263009978 is a wasteful number, since it uses less digits than its factorization.

1306263009978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36341598 (or 36341595 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 1306263009978 in words is "one trillion, three hundred six billion, two hundred sixty-three million, nine thousand, nine hundred seventy-eight".