2155458549904 has 135 divisors (see below), whose sum is σ = 4675402553913. Its totient is φ = 961930569600.

The previous prime is 2155458549901. The next prime is 2155458549943. The reversal of 2155458549904 is 4099458545512.

It is a happy number.

The square root of 2155458549904 is 1468148.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 70091503504 + 2085367046400 = 264748^2 + 1444080^2 .

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155458549901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3940508959 + ... + 3940509505.

Almost surely, 2^{2155458549904} is an apocalyptic number.

2155458549904 is the 1468148-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155458549904

2155458549904 is an abundant number, since it is smaller than the sum of its proper divisors (2519944004009).

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

2155458549904 is an frugal number, since it uses more digits than its factorization.

2155458549904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 51840000, while the sum is 61.

The spelling of 2155458549904 in words is "two trillion, one hundred fifty-five billion, four hundred fifty-eight million, five hundred forty-nine thousand, nine hundred four".