2153777856 has 56 divisors (see below), whose sum is σ = 5713384560. Its totient is φ = 716055552.

The previous prime is 2153777849. The next prime is 2153777909. The reversal of 2153777856 is 6587773512.

It is a junction number, because it is equal to n+sod(n) for n = 2153777799 and 2153777808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60270 + ... + 89106.

Almost surely, 2^2153777856 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 2153777856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2856692280).

2153777856 is an abundant number, since it is smaller than the sum of its proper divisors (3559606704).

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

2153777856 is a wasteful number, since it uses less digits than its factorization.

2153777856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29241 (or 29231 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 51.

The square root of 2153777856 is about 46408.8122666375. The cubic root of 2153777856 is about 1291.4183977882.

The spelling of 2153777856 in words is "two billion, one hundred fifty-three million, seven hundred seventy-seven thousand, eight hundred fifty-six".