2145540144 has 80 divisors (see below), whose sum is σ = 6123179520. Its totient is φ = 641921280.

The previous prime is 2145540143. The next prime is 2145540151. The reversal of 2145540144 is 4410455412.

It is not an unprimeable number, because it can be changed into a prime (2145540143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15994 + ... + 67430.

It is an arithmetic number, because the mean of its divisors is an integer number (76539744).

Almost surely, 2^2145540144 is an apocalyptic number.

2145540144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2145540144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3061589760).

2145540144 is an abundant number, since it is smaller than the sum of its proper divisors (3977639376).

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

2145540144 is a wasteful number, since it uses less digits than its factorization.

2145540144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51538 (or 51532 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 2145540144 is about 46319.9756476620. The cubic root of 2145540144 is about 1289.7698333418.

Adding to 2145540144 its reverse (4410455412), we get a palindrome (6555995556).

The spelling of 2145540144 in words is "two billion, one hundred forty-five million, five hundred forty thousand, one hundred forty-four".