6541249668 has 12 divisors (see below), whose sum is σ = 15262915920. Its totient is φ = 2180416552.

The previous prime is 6541249651. The next prime is 6541249697. The reversal of 6541249668 is 8669421456.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×6541249668² = 85575894438220220448, 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 6541249668.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272552058 + ... + 272552081.

It is an arithmetic number, because the mean of its divisors is an integer number (1271909660).

Almost surely, 2^6541249668 is an apocalyptic number.

It is an amenable number.

6541249668 is an abundant number, since it is smaller than the sum of its proper divisors (8721666252).

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

6541249668 is a wasteful number, since it uses less digits than its factorization.

6541249668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545104146 (or 545104144 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The square root of 6541249668 is about 80877.9924825042. The cubic root of 6541249668 is about 1870.1950732089.

The spelling of 6541249668 in words is "six billion, five hundred forty-one million, two hundred forty-nine thousand, six hundred sixty-eight".