6541997280 has 192 divisors, whose sum is σ = 25362989568. Its totient is φ = 1380280320.

The previous prime is 6541997279. The next prime is 6541997291. The reversal of 6541997280 is 827991456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31206 + ... + 118565.

It is an arithmetic number, because the mean of its divisors is an integer number (132098904).

Almost surely, 2^6541997280 is an apocalyptic number.

6541997280 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 6541997280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12681494784).

6541997280 is an abundant number, since it is smaller than the sum of its proper divisors (18820992288).

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

6541997280 is a wasteful number, since it uses less digits than its factorization.

6541997280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149809 (or 149801 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 6541997280 is about 80882.6142010754. The cubic root of 6541997280 is about 1870.2663198914.

The spelling of 6541997280 in words is "six billion, five hundred forty-one million, nine hundred ninety-seven thousand, two hundred eighty".