6540865980 has 48 divisors (see below), whose sum is σ = 19979374464. Its totient is φ = 1585664320.

The previous prime is 6540865951. The next prime is 6540866041. The reversal of 6540865980 is 895680456.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4954542 + ... + 4955861.

It is an arithmetic number, because the mean of its divisors is an integer number (416236968).

Almost surely, 2^6540865980 is an apocalyptic number.

6540865980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6540865980 is an abundant number, since it is smaller than the sum of its proper divisors (13438508484).

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

6540865980 is a wasteful number, since it uses less digits than its factorization.

6540865980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910426 (or 9910424 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 6540865980 is about 80875.6204303868. The cubic root of 6540865980 is about 1870.1585060148.

It can be divided in two parts, 654086 and 5980, that added together give a palindrome (660066).

The spelling of 6540865980 in words is "six billion, five hundred forty million, eight hundred sixty-five thousand, nine hundred eighty".