1220435309857 has 2 divisors, whose sum is σ = 1220435309858. Its totient is φ = 1220435309856.

The previous prime is 1220435309851. The next prime is 1220435309869. The reversal of 1220435309857 is 7589035340221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677673057681 + 542762252176 = 823209^2 + 736724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220435309857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220435309857.

It is not a weakly prime, because it can be changed into another prime (1220435309851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610217654928 + 610217654929.

It is an arithmetic number, because the mean of its divisors is an integer number (610217654929).

Almost surely, 2^{1220435309857} is an apocalyptic number.

It is an amenable number.

1220435309857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220435309857 is an equidigital number, since it uses as much as digits as its factorization.

1220435309857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 1220435309857 in words is "one trillion, two hundred twenty billion, four hundred thirty-five million, three hundred nine thousand, eight hundred fifty-seven".