2155203968 has 64 divisors (see below), whose sum is σ = 4561174800. Its totient is φ = 1010860032.

The previous prime is 2155203961. The next prime is 2155204001. The reversal of 2155203968 is 8693025512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155203961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731843 + ... + 734781.

Almost surely, 2^2155203968 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 2155203968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280587400).

2155203968 is an abundant number, since it is smaller than the sum of its proper divisors (2405970832).

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

2155203968 is a wasteful number, since it uses less digits than its factorization.

2155203968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307 (or 3295 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 2155203968 is about 46424.1743922280. The cubic root of 2155203968 is about 1291.7033700640.

The spelling of 2155203968 in words is "two billion, one hundred fifty-five million, two hundred three thousand, nine hundred sixty-eight".