1720145102556 has 48 divisors (see below), whose sum is σ = 4160013782400. Its totient is φ = 552551332032.

The previous prime is 1720145102539. The next prime is 1720145102563. The reversal of 1720145102556 is 6552015410271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4543566 + ... + 4907573.

It is an arithmetic number, because the mean of its divisors is an integer number (86666953800).

Almost surely, 2^{1720145102556} is an apocalyptic number.

It is an amenable number.

1720145102556 is an abundant number, since it is smaller than the sum of its proper divisors (2439868679844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1720145102556 is a wasteful number, since it uses less digits than its factorization.

1720145102556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451698 (or 9451696 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 39.

The spelling of 1720145102556 in words is "one trillion, seven hundred twenty billion, one hundred forty-five million, one hundred two thousand, five hundred fifty-six".