2681963761 has 4 divisors (see below), whose sum is σ = 2774445300. Its totient is φ = 2589482224.

The previous prime is 2681963747. The next prime is 2681963777. The reversal of 2681963761 is 1673691862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1604483136 + 1077480625 = 40056^2 + 32825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681963761 - 2¹⁹ = 2681439473 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681963261) 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 3 ways as a sum of consecutive naturals, for example, 46240726 + ... + 46240783.

It is an arithmetic number, because the mean of its divisors is an integer number (693611325).

Almost surely, 2^2681963761 is an apocalyptic number.

It is an amenable number.

2681963761 is a deficient number, since it is larger than the sum of its proper divisors (92481539).

2681963761 is an equidigital number, since it uses as much as digits as its factorization.

2681963761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92481538.

The product of its digits is 653184, while the sum is 49.

The square root of 2681963761 is about 51787.6796255635. The cubic root of 2681963761 is about 1389.3690977752.

The spelling of 2681963761 in words is "two billion, six hundred eighty-one million, nine hundred sixty-three thousand, seven hundred sixty-one".