6540223512 has 128 divisors (see below), whose sum is σ = 17699328000. Its totient is φ = 2008005120.

The previous prime is 6540223511. The next prime is 6540223523. The reversal of 6540223512 is 2153220456.

It is a super-2 number, since 2×6540223512² = 85549047173835228288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6540223512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540223511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3917814 + ... + 3919482.

It is an arithmetic number, because the mean of its divisors is an integer number (138276000).

Almost surely, 2^6540223512 is an apocalyptic number.

6540223512 is a gapful number since it is divisible by the number (62) 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 6540223512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8849664000).

6540223512 is an abundant number, since it is smaller than the sum of its proper divisors (11159104488).

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

6540223512 is a wasteful number, since it uses less digits than its factorization.

6540223512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6540223512 is about 80871.6483818650. The cubic root of 6540223512 is about 1870.0972727194.

Adding to 6540223512 its reverse (2153220456), we get a palindrome (8693443968).

The spelling of 6540223512 in words is "six billion, five hundred forty million, two hundred twenty-three thousand, five hundred twelve".