1207718478261 has 18 divisors (see below), whose sum is σ = 1792904708322. Its totient is φ = 783384950880.

The previous prime is 1207718478143. The next prime is 1207718478269. The reversal of 1207718478261 is 1628748177021.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 516544064100 + 691174414161 = 718710^2 + 831369^2 .

It is not a de Polignac number, because 1207718478261 - 2⁷ = 1207718478133 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1207718478198 and 1207718478207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207718478269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48998250 + ... + 49022891.

It is an arithmetic number, because the mean of its divisors is an integer number (99605817129).

Almost surely, 2^{1207718478261} is an apocalyptic number.

It is an amenable number.

1207718478261 is a deficient number, since it is larger than the sum of its proper divisors (585186230061).

1207718478261 is an equidigital number, since it uses as much as digits as its factorization.

1207718478261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98021221 (or 98021181 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 1207718478261 in words is "one trillion, two hundred seven billion, seven hundred eighteen million, four hundred seventy-eight thousand, two hundred sixty-one".