5541621540 has 288 divisors, whose sum is σ = 19417418496. Its totient is φ = 1156147200.

The previous prime is 5541621521. The next prime is 5541621557. The reversal of 5541621540 is 451261455.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7168594 + ... + 7169366.

It is an arithmetic number, because the mean of its divisors is an integer number (67421592).

Almost surely, 2^5541621540 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 5541621540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9708709248).

5541621540 is an abundant number, since it is smaller than the sum of its proper divisors (13875796956).

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

5541621540 is a wasteful number, since it uses less digits than its factorization.

5541621540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 5541621540 is about 74442.0683484816. The cubic root of 5541621540 is about 1769.6156655389.

Adding to 5541621540 its reverse (451261455), we get a palindrome (5992882995).

The spelling of 5541621540 in words is "five billion, five hundred forty-one million, six hundred twenty-one thousand, five hundred forty".