3811248560681 has 4 divisors (see below), whose sum is σ = 3811313554692. Its totient is φ = 3811183566672.

The previous prime is 3811248560663. The next prime is 3811248560701. The reversal of 3811248560681 is 1860658421183.

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 2572524080281 + 1238724480400 = 1603909^2 + 1112980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3811248560681 is a prime.

It is a super-2 number, since 2×3811248560681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3811248560621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32408966 + ... + 32526351.

It is an arithmetic number, because the mean of its divisors is an integer number (952828388673).

Almost surely, 2^{3811248560681} is an apocalyptic number.

It is an amenable number.

3811248560681 is a deficient number, since it is larger than the sum of its proper divisors (64994011).

3811248560681 is an equidigital number, since it uses as much as digits as its factorization.

3811248560681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64994010.

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 3811248560681 in words is "three trillion, eight hundred eleven billion, two hundred forty-eight million, five hundred sixty thousand, six hundred eighty-one".