811564880628120 has 128 divisors (see below), whose sum is σ = 2455244352000000. Its totient is φ = 214593306071040.

The previous prime is 811564880628071. The next prime is 811564880628143. The reversal of 811564880628120 is 21826088465118.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1032760 + ... + 40301319.

It is an arithmetic number, because the mean of its divisors is an integer number (19181596500000).

Almost surely, 2^{811564880628120} 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 811564880628120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227622176000000).

811564880628120 is an abundant number, since it is smaller than the sum of its proper divisors (1643679471371880).

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

811564880628120 is a wasteful number, since it uses less digits than its factorization.

811564880628120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41335473 (or 41335469 counting only the distinct ones).

The product of its (nonzero) digits is 11796480, while the sum is 60.

The spelling of 811564880628120 in words is "eight hundred eleven trillion, five hundred sixty-four billion, eight hundred eighty million, six hundred twenty-eight thousand, one hundred twenty".