863651880861 has 48 divisors (see below), whose sum is σ = 1496960232768. Its totient is φ = 437707603200.

The previous prime is 863651880857. The next prime is 863651880901. The reversal of 863651880861 is 168088156368.

It is not a de Polignac number, because 863651880861 - 2² = 863651880857 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 863651880795 and 863651880804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863651880061) 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 47 ways as a sum of consecutive naturals, for example, 6447210 + ... + 6579803.

It is an arithmetic number, because the mean of its divisors is an integer number (31186671516).

Almost surely, 2^863651880861 is an apocalyptic number.

It is an amenable number.

863651880861 is a deficient number, since it is larger than the sum of its proper divisors (633308351907).

863651880861 is a wasteful number, since it uses less digits than its factorization.

863651880861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13027082 (or 13027075 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 60.

The spelling of 863651880861 in words is "eight hundred sixty-three billion, six hundred fifty-one million, eight hundred eighty thousand, eight hundred sixty-one".