1721880542613 has 40 divisors (see below), whose sum is σ = 2921805382176. Its totient is φ = 894483357600.

The previous prime is 1721880542609. The next prime is 1721880542633. The reversal of 1721880542613 is 3162450881271.

It is not a de Polignac number, because 1721880542613 - 2² = 1721880542609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721880542633) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10786698 + ... + 10945163.

Almost surely, 2^{1721880542613} is an apocalyptic number.

It is an amenable number.

1721880542613 is a deficient number, since it is larger than the sum of its proper divisors (1199924839563).

1721880542613 is an equidigital number, since it uses as much as digits as its factorization.

1721880542613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21731903 (or 21731882 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 1721880542613 in words is "one trillion, seven hundred twenty-one billion, eight hundred eighty million, five hundred forty-two thousand, six hundred thirteen".