1720077573749 has 2 divisors, whose sum is σ = 1720077573750. Its totient is φ = 1720077573748.

The previous prime is 1720077573659. The next prime is 1720077573791. The reversal of 1720077573749 is 9473757700271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1353802060900 + 366275512849 = 1163530^2 + 605207^2 .

It is an emirp because it is prime and its reverse (9473757700271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720077573749 - 2⁸ = 1720077573493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720077573349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860038786874 + 860038786875.

It is an arithmetic number, because the mean of its divisors is an integer number (860038786875).

Almost surely, 2^{1720077573749} is an apocalyptic number.

It is an amenable number.

1720077573749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720077573749 is an equidigital number, since it uses as much as digits as its factorization.

1720077573749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18151560, while the sum is 59.

The spelling of 1720077573749 in words is "one trillion, seven hundred twenty billion, seventy-seven million, five hundred seventy-three thousand, seven hundred forty-nine".