2687804931981 has 16 divisors (see below), whose sum is σ = 3992495391360. Its totient is φ = 1596998155200.

The previous prime is 2687804931979. The next prime is 2687804931991. The reversal of 2687804931981 is 1891394087862.

It is not a de Polignac number, because 2687804931981 - 2¹ = 2687804931979 is a prime.

It is a super-3 number, since 3×2687804931981³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2687804931901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1188241545 + ... + 1188243806.

It is an arithmetic number, because the mean of its divisors is an integer number (249530961960).

Almost surely, 2^{2687804931981} is an apocalyptic number.

It is an amenable number.

2687804931981 is a deficient number, since it is larger than the sum of its proper divisors (1304690459379).

2687804931981 is a wasteful number, since it uses less digits than its factorization.

2687804931981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376485396.

The product of its (nonzero) digits is 41803776, while the sum is 66.

The spelling of 2687804931981 in words is "two trillion, six hundred eighty-seven billion, eight hundred four million, nine hundred thirty-one thousand, nine hundred eighty-one".