6909249685 has 16 divisors (see below), whose sum is σ = 9146657520. Its totient is φ = 4977768960.

The previous prime is 6909249671. The next prime is 6909249727. The reversal of 6909249685 is 5869429096.

It can be written as a sum of positive squares in 8 ways, for example, as 3760019761 + 3149229924 = 61319^2 + 56118^2 .

It is not a de Polignac number, because 6909249685 - 2²¹ = 6907152533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1293630 + ... + 1298959.

It is an arithmetic number, because the mean of its divisors is an integer number (571666095).

Almost surely, 2^6909249685 is an apocalyptic number.

6909249685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6909249685 is a deficient number, since it is larger than the sum of its proper divisors (2237407835).

6909249685 is a wasteful number, since it uses less digits than its factorization.

6909249685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592648.

The product of its (nonzero) digits is 8398080, while the sum is 58.

The square root of 6909249685 is about 83121.8965435703. The cubic root of 6909249685 is about 1904.6285753181.

The spelling of 6909249685 in words is "six billion, nine hundred nine million, two hundred forty-nine thousand, six hundred eighty-five".