613996832821 has 8 divisors (see below), whose sum is σ = 614262042200. Its totient is φ = 613731686400.

The previous prime is 613996832807. The next prime is 613996832831. The reversal of 613996832821 is 128238699316.

It can be written as a sum of positive squares in 4 ways, for example, as 175506534225 + 438490298596 = 418935^2 + 662186^2 .

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

It is a 10-Lehmer number, since φ(613996832821) divides (613996832821-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 613996832821 - 2¹¹ = 613996830773 is a prime.

It is a super-2 number, since 2×613996832821² (a number of 24 digits) contains 22 as substring.

It is the 783580-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613996832831) by changing a digit.

It is a nontrivial repunit in base 783579.

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 7 ways as a sum of consecutive naturals, for example, 31495045 + ... + 31514533.

It is an arithmetic number, because the mean of its divisors is an integer number (76782755275).

Almost surely, 2^613996832821 is an apocalyptic number.

It is an amenable number.

613996832821 is a deficient number, since it is larger than the sum of its proper divisors (265209379).

613996832821 is a wasteful number, since it uses less digits than its factorization.

613996832821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31479.

The product of its digits is 6718464, while the sum is 58.

The spelling of 613996832821 in words is "six hundred thirteen billion, nine hundred ninety-six million, eight hundred thirty-two thousand, eight hundred twenty-one".