613661685 has 32 divisors (see below), whose sum is σ = 1208444160. Its totient is φ = 258951168.

The previous prime is 613661681. The next prime is 613661701. The reversal of 613661685 is 586166316.

It is not a de Polignac number, because 613661685 - 2² = 613661681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613661681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223420 + ... + 226149.

It is an arithmetic number, because the mean of its divisors is an integer number (37763880).

Almost surely, 2^613661685 is an apocalyptic number.

613661685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

613661685 is a deficient number, since it is larger than the sum of its proper divisors (594782475).

613661685 is a wasteful number, since it uses less digits than its factorization.

613661685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449597.

The product of its digits is 155520, while the sum is 42.

The square root of 613661685 is about 24772.1958049746. The cubic root of 613661685 is about 849.7861907442.

The spelling of 613661685 in words is "six hundred thirteen million, six hundred sixty-one thousand, six hundred eighty-five".