2109364656 has 160 divisors (see below), whose sum is σ = 6452920320. Its totient is φ = 581236992.

The previous prime is 2109364643. The next prime is 2109364657. The reversal of 2109364656 is 6564639012.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (2109364657) 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, 1198305 + ... + 1200063.

It is an arithmetic number, because the mean of its divisors is an integer number (40330752).

Almost surely, 2^2109364656 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 2109364656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3226460160).

2109364656 is an abundant number, since it is smaller than the sum of its proper divisors (4343555664).

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

2109364656 is a wasteful number, since it uses less digits than its factorization.

2109364656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 2109364656 is about 45927.8200658381. The cubic root of 2109364656 is about 1282.4798636496.

The spelling of 2109364656 in words is "two billion, one hundred nine million, three hundred sixty-four thousand, six hundred fifty-six".