1720156399613 has 2 divisors, whose sum is σ = 1720156399614. Its totient is φ = 1720156399612.

The previous prime is 1720156399603. The next prime is 1720156399649. The reversal of 1720156399613 is 3169936510271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416949787449 + 303206612164 = 1190357^2 + 550642^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720156399613 - 2¹⁴ = 1720156383229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720156399603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860078199806 + 860078199807.

It is an arithmetic number, because the mean of its divisors is an integer number (860078199807).

Almost surely, 2^{1720156399613} is an apocalyptic number.

It is an amenable number.

1720156399613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720156399613 is an equidigital number, since it uses as much as digits as its factorization.

1720156399613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 1720156399613 in words is "one trillion, seven hundred twenty billion, one hundred fifty-six million, three hundred ninety-nine thousand, six hundred thirteen".