2687865159841 has 3 divisors (see below), whose sum is σ = 2687866799313. Its totient is φ = 2687863520370.

The previous prime is 2687865159799. The next prime is 2687865159871. The reversal of 2687865159841 is 1489515687862.

The square root of 2687865159841 is 1639471.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-2687865159841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2687865159871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 819736 + ... + 2459206.

It is an arithmetic number, because the mean of its divisors is an integer number (895955599771).

Almost surely, 2^{2687865159841} is an apocalyptic number.

2687865159841 is the 1639471-st square number.

2687865159841 is the 819736-th centered octagonal number.

It is an amenable number.

2687865159841 is a deficient number, since it is larger than the sum of its proper divisors (1639472).

2687865159841 is an frugal number, since it uses more digits than its factorization.

2687865159841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278942 (or 1639471 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 70.

The spelling of 2687865159841 in words is "two trillion, six hundred eighty-seven billion, eight hundred sixty-five million, one hundred fifty-nine thousand, eight hundred forty-one".