6685618617 has 24 divisors (see below), whose sum is σ = 9994795200. Its totient is φ = 4301323488.

The previous prime is 6685618613. The next prime is 6685618637. The reversal of 6685618617 is 7168165866.

6685618617 is a `hidden beast` number, since 6 + 6 + 8 + 5 + 6 + 18 + 617 = 666.

It is not a de Polignac number, because 6685618617 - 2² = 6685618613 is a prime.

It is a super-3 number, since 3×6685618617³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6685618613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 690234 + ... + 699852.

It is an arithmetic number, because the mean of its divisors is an integer number (416449800).

Almost surely, 2^6685618617 is an apocalyptic number.

It is an amenable number.

6685618617 is a deficient number, since it is larger than the sum of its proper divisors (3309176583).

6685618617 is a wasteful number, since it uses less digits than its factorization.

6685618617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12317 (or 12314 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 6685618617 is about 81765.6322485187. The cubic root of 6685618617 is about 1883.8538172444.

The spelling of 6685618617 in words is "six billion, six hundred eighty-five million, six hundred eighteen thousand, six hundred seventeen".