613161661 has 16 divisors (see below), whose sum is σ = 743800320. Its totient is φ = 493436160.

The previous prime is 613161649. The next prime is 613161677. The reversal of 613161661 is 166161316.

It is not a de Polignac number, because 613161661 - 2⁵ = 613161629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613161631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43980 + ... + 56218.

It is an arithmetic number, because the mean of its divisors is an integer number (46487520).

Almost surely, 2^613161661 is an apocalyptic number.

It is an amenable number.

613161661 is a deficient number, since it is larger than the sum of its proper divisors (130638659).

613161661 is a wasteful number, since it uses less digits than its factorization.

613161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12684.

The product of its digits is 3888, while the sum is 31.

The square root of 613161661 is about 24762.1013042108. The cubic root of 613161661 is about 849.5553203465. Note that the first 3 decimals are identical.

The spelling of 613161661 in words is "six hundred thirteen million, one hundred sixty-one thousand, six hundred sixty-one".