1229658180856 has 256 divisors, whose sum is σ = 3073193395200. Its totient is φ = 448552525824.

The previous prime is 1229658180853. The next prime is 1229658180899. The reversal of 1229658180856 is 6580818569221.

It is a junction number, because it is equal to n+sod(n) for n = 1229658180794 and 1229658180803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229658180853) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35453235 + ... + 35487901.

It is an arithmetic number, because the mean of its divisors is an integer number (12004661700).

Almost surely, 2^{1229658180856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229658180856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1536596697600).

1229658180856 is an abundant number, since it is smaller than the sum of its proper divisors (1843535214344).

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

1229658180856 is a wasteful number, since it uses less digits than its factorization.

1229658180856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34806 (or 34802 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 61.

The spelling of 1229658180856 in words is "one trillion, two hundred twenty-nine billion, six hundred fifty-eight million, one hundred eighty thousand, eight hundred fifty-six".