6540540026220 has 144 divisors (see below), whose sum is σ = 20380045008960. Its totient is φ = 1696655144448.

The previous prime is 6540540026171. The next prime is 6540540026311. The reversal of 6540540026220 is 226200450456.

6540540026220 is a `hidden beast` number, since 6 + 5 + 4 + 0 + 5 + 400 + 26 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 33021441 + ... + 33218919.

It is an arithmetic number, because the mean of its divisors is an integer number (141528090340).

Almost surely, 2^{6540540026220} is an apocalyptic number.

6540540026220 is a gapful number since it is divisible by the number (60) 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 6540540026220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10190022504480).

6540540026220 is an abundant number, since it is smaller than the sum of its proper divisors (13839504982740).

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

6540540026220 is a wasteful number, since it uses less digits than its factorization.

6540540026220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202504 (or 202499 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 6540540026220 its reverse (226200450456), we get a palindrome (6766740476676).

The spelling of 6540540026220 in words is "six trillion, five hundred forty billion, five hundred forty million, twenty-six thousand, two hundred twenty".