863959421955 has 32 divisors (see below), whose sum is σ = 1583330112000. Its totient is φ = 394073229312.

The previous prime is 863959421951. The next prime is 863959421989. The reversal of 863959421955 is 559124959368.

863959421955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 863959421955 - 2² = 863959421951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (863959421951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9115645 + ... + 9209934.

It is an arithmetic number, because the mean of its divisors is an integer number (49479066000).

Almost surely, 2^863959421955 is an apocalyptic number.

863959421955 is a deficient number, since it is larger than the sum of its proper divisors (719370690045).

863959421955 is a wasteful number, since it uses less digits than its factorization.

863959421955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18326043.

The product of its digits is 104976000, while the sum is 66.

The spelling of 863959421955 in words is "eight hundred sixty-three billion, nine hundred fifty-nine million, four hundred twenty-one thousand, nine hundred fifty-five".