1720145102557 has 16 divisors (see below), whose sum is σ = 2018306934400. Its totient is φ = 1465364579616.

The previous prime is 1720145102539. The next prime is 1720145102563. The reversal of 1720145102557 is 7552015410271.

It is a de Polignac number, because none of the positive numbers 2^k-1720145102557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720145102537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15327528 + ... + 15439345.

It is an arithmetic number, because the mean of its divisors is an integer number (126144183400).

Almost surely, 2^{1720145102557} is an apocalyptic number.

It is an amenable number.

1720145102557 is a deficient number, since it is larger than the sum of its proper divisors (298161831843).

1720145102557 is an equidigital number, since it uses as much as digits as its factorization.

1720145102557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30767057 (or 30767043 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 40.

The spelling of 1720145102557 in words is "one trillion, seven hundred twenty billion, one hundred forty-five million, one hundred two thousand, five hundred fifty-seven".