1220781383873 has 8 divisors (see below), whose sum is σ = 1226073750408. Its totient is φ = 1215489470464.

The previous prime is 1220781383867. The next prime is 1220781383891. The reversal of 1220781383873 is 3783831870221.

It can be written as a sum of positive squares in 4 ways, for example, as 307174218289 + 913607165584 = 554233^2 + 955828^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220781383873 - 2²⁰ = 1220780335297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220781383813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5999165 + ... + 6199317.

It is an arithmetic number, because the mean of its divisors is an integer number (153259218801).

Almost surely, 2^{1220781383873} is an apocalyptic number.

It is an amenable number.

1220781383873 is a deficient number, since it is larger than the sum of its proper divisors (5292366535).

1220781383873 is a wasteful number, since it uses less digits than its factorization.

1220781383873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226563.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 1220781383873 in words is "one trillion, two hundred twenty billion, seven hundred eighty-one million, three hundred eighty-three thousand, eight hundred seventy-three".