1720121953819 has 2 divisors, whose sum is σ = 1720121953820. Its totient is φ = 1720121953818.

The previous prime is 1720121953811. The next prime is 1720121953859. The reversal of 1720121953819 is 9183591210271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720121953819 - 2³ = 1720121953811 is a prime.

It is a super-2 number, since 2×1720121953819² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1720121953811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860060976909 + 860060976910.

It is an arithmetic number, because the mean of its divisors is an integer number (860060976910).

Almost surely, 2^{1720121953819} is an apocalyptic number.

1720121953819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720121953819 is an equidigital number, since it uses as much as digits as its factorization.

1720121953819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 1720121953819 in words is "one trillion, seven hundred twenty billion, one hundred twenty-one million, nine hundred fifty-three thousand, eight hundred nineteen".