6999378861 has 8 divisors (see below), whose sum is σ = 9337872544. Its totient is φ = 4663568880.

The previous prime is 6999378857. The next prime is 6999378959. The reversal of 6999378861 is 1688739996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6999378861 - 2² = 6999378857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6999378792 and 6999378801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6999378761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664831 + ... + 675276.

It is an arithmetic number, because the mean of its divisors is an integer number (1167234068).

Almost surely, 2^6999378861 is an apocalyptic number.

It is an amenable number.

6999378861 is a deficient number, since it is larger than the sum of its proper divisors (2338493683).

6999378861 is a wasteful number, since it uses less digits than its factorization.

6999378861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341851.

The product of its digits is 35271936, while the sum is 66.

The square root of 6999378861 is about 83662.2905555424. The cubic root of 6999378861 is about 1912.8746003291.

The spelling of 6999378861 in words is "six billion, nine hundred ninety-nine million, three hundred seventy-eight thousand, eight hundred sixty-one".