813860229681 has 6 divisors (see below), whose sum is σ = 1175575887330. Its totient is φ = 542573486448.

The previous prime is 813860229673. The next prime is 813860229691. The reversal of 813860229681 is 186922068318.

813860229681 is a `hidden beast` number, since 8 + 1 + 3 + 8 + 602 + 29 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 777394890000 + 36465339681 = 881700^2 + 190959^2 .

It is not a de Polignac number, because 813860229681 - 2³ = 813860229673 is a prime.

It is a super-2 number, since 2×813860229681² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (813860229691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45214457196 + ... + 45214457213.

It is an arithmetic number, because the mean of its divisors is an integer number (195929314555).

Almost surely, 2^813860229681 is an apocalyptic number.

It is an amenable number.

813860229681 is a deficient number, since it is larger than the sum of its proper divisors (361715657649).

813860229681 is a wasteful number, since it uses less digits than its factorization.

813860229681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90428914415 (or 90428914412 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 813860229681 in words is "eight hundred thirteen billion, eight hundred sixty million, two hundred twenty-nine thousand, six hundred eighty-one".