6840821792986 has 8 divisors (see below), whose sum is σ = 10261244125044. Its totient is φ = 3420407084640.

The previous prime is 6840821792969. The next prime is 6840821792993. The reversal of 6840821792986 is 6892971280486.

It can be written as a sum of positive squares in 2 ways, for example, as 3927590694225 + 2913231098761 = 1981815^2 + 1706819^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707406 + ... + 4073926.

Almost surely, 2^{6840821792986} is an apocalyptic number.

6840821792986 is a deficient number, since it is larger than the sum of its proper divisors (3420422332058).

6840821792986 is a wasteful number, since it uses less digits than its factorization.

6840821792986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811856.

The product of its (nonzero) digits is 167215104, while the sum is 70.

The spelling of 6840821792986 in words is "six trillion, eight hundred forty billion, eight hundred twenty-one million, seven hundred ninety-two thousand, nine hundred eighty-six".