1220199995617 has 2 divisors, whose sum is σ = 1220199995618. Its totient is φ = 1220199995616.

The previous prime is 1220199995603. The next prime is 1220199995633. The reversal of 1220199995617 is 7165999910221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219966639441 + 233356176 = 1104521^2 + 15276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220199995617 - 2¹⁹ = 1220199471329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220199995687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610099997808 + 610099997809.

It is an arithmetic number, because the mean of its divisors is an integer number (610099997809).

Almost surely, 2^{1220199995617} is an apocalyptic number.

It is an amenable number.

1220199995617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220199995617 is an equidigital number, since it uses as much as digits as its factorization.

1220199995617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 61.

The spelling of 1220199995617 in words is "one trillion, two hundred twenty billion, one hundred ninety-nine million, nine hundred ninety-five thousand, six hundred seventeen".