2685609780981 has 8 divisors (see below), whose sum is σ = 3617728640064. Its totient is φ = 1771948721280.

The previous prime is 2685609780979. The next prime is 2685609780991. The reversal of 2685609780981 is 1890879065862.

2685609780981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2685609780981 - 2¹ = 2685609780979 is a prime.

It is a super-2 number, since 2×2685609780981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685609780991) 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, 4614449505 + ... + 4614450086.

It is an arithmetic number, because the mean of its divisors is an integer number (452216080008).

Almost surely, 2^{2685609780981} is an apocalyptic number.

It is an amenable number.

2685609780981 is a deficient number, since it is larger than the sum of its proper divisors (932118859083).

2685609780981 is an equidigital number, since it uses as much as digits as its factorization.

2685609780981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9228899691.

The product of its (nonzero) digits is 104509440, while the sum is 69.

The spelling of 2685609780981 in words is "two trillion, six hundred eighty-five billion, six hundred nine million, seven hundred eighty thousand, nine hundred eighty-one".