613681645 has 16 divisors (see below), whose sum is σ = 756641088. Its totient is φ = 477535360.

The previous prime is 613681637. The next prime is 613681661. The reversal of 613681645 is 546186316.

It is not a de Polignac number, because 613681645 - 2³ = 613681637 is a prime.

It is a super-3 number, since 3×613681645³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 613681598 and 613681607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66822 + ... + 75448.

It is an arithmetic number, because the mean of its divisors is an integer number (47290068).

Almost surely, 2^613681645 is an apocalyptic number.

It is an amenable number.

613681645 is a deficient number, since it is larger than the sum of its proper divisors (142959443).

613681645 is a wasteful number, since it uses less digits than its factorization.

613681645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9020.

The product of its digits is 103680, while the sum is 40.

The square root of 613681645 is about 24772.5986727271. The cubic root of 613681645 is about 849.7954040447.

The spelling of 613681645 in words is "six hundred thirteen million, six hundred eighty-one thousand, six hundred forty-five".