1721136042655 has 8 divisors (see below), whose sum is σ = 2131987872384. Its totient is φ = 1332492420000.

The previous prime is 1721136042589. The next prime is 1721136042679. The reversal of 1721136042655 is 5562406311271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1721136042655 - 2¹⁹ = 1721135518367 is a prime.

It is a super-2 number, since 2×1721136042655² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5552051596 + ... + 5552051905.

It is an arithmetic number, because the mean of its divisors is an integer number (266498484048).

Almost surely, 2^{1721136042655} is an apocalyptic number.

1721136042655 is a deficient number, since it is larger than the sum of its proper divisors (410851829729).

1721136042655 is a wasteful number, since it uses less digits than its factorization.

1721136042655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104103537.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 1721136042655 in words is "one trillion, seven hundred twenty-one billion, one hundred thirty-six million, forty-two thousand, six hundred fifty-five".