6685679139 has 16 divisors (see below), whose sum is σ = 9206568960. Its totient is φ = 4311103680.

The previous prime is 6685679089. The next prime is 6685679159. The reversal of 6685679139 is 9319765866.

It is not a de Polignac number, because 6685679139 - 2¹³ = 6685670947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6685679159) 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, 171999 + ... + 207255.

It is an arithmetic number, because the mean of its divisors is an integer number (575410560).

Almost surely, 2^6685679139 is an apocalyptic number.

6685679139 is a deficient number, since it is larger than the sum of its proper divisors (2520889821).

6685679139 is a wasteful number, since it uses less digits than its factorization.

6685679139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37330.

The product of its digits is 14696640, while the sum is 60.

The square root of 6685679139 is about 81766.0023420492. The cubic root of 6685679139 is about 1883.8595017972.

The spelling of 6685679139 in words is "six billion, six hundred eighty-five million, six hundred seventy-nine thousand, one hundred thirty-nine".