2163959278900 has 36 divisors (see below), whose sum is σ = 4700719220652. Its totient is φ = 864675400960.

The previous prime is 2163959278849. The next prime is 2163959278907. The reversal of 2163959278900 is 98729593612.

It can be written as a sum of positive squares in 6 ways, for example, as 201416054436 + 1962543224464 = 448794^2 + 1400908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163959278907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11258107 + ... + 11448706.

It is an arithmetic number, because the mean of its divisors is an integer number (130575533907).

Almost surely, 2^{2163959278900} is an apocalyptic number.

2163959278900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2163959278900 is an abundant number, since it is smaller than the sum of its proper divisors (2536759941752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2163959278900 is a wasteful number, since it uses less digits than its factorization.

2163959278900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22707780 (or 22707773 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 2163959278900 in words is "two trillion, one hundred sixty-three billion, nine hundred fifty-nine million, two hundred seventy-eight thousand, nine hundred".