6686274949 has 4 divisors (see below), whose sum is σ = 6686994240. Its totient is φ = 6685555660.

The previous prime is 6686274941. The next prime is 6686274989. The reversal of 6686274949 is 9494726866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6686274949 - 2³ = 6686274941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686274941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345517 + ... + 364354.

It is an arithmetic number, because the mean of its divisors is an integer number (1671748560).

Almost surely, 2^6686274949 is an apocalyptic number.

It is an amenable number.

6686274949 is a deficient number, since it is larger than the sum of its proper divisors (719291).

6686274949 is an equidigital number, since it uses as much as digits as its factorization.

6686274949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719290.

The product of its digits is 31352832, while the sum is 61.

The square root of 6686274949 is about 81769.6456455573. The cubic root of 6686274949 is about 1883.9154616564.

The spelling of 6686274949 in words is "six billion, six hundred eighty-six million, two hundred seventy-four thousand, nine hundred forty-nine".