6645256541 has 8 divisors (see below), whose sum is σ = 8284995264. Its totient is φ = 5178121920.

The previous prime is 6645256483. The next prime is 6645256561. The reversal of 6645256541 is 1456525466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6645256541 - 2¹⁰ = 6645255517 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6645256492 and 6645256501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645256561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43150940 + ... + 43151093.

It is an arithmetic number, because the mean of its divisors is an integer number (1035624408).

Almost surely, 2^6645256541 is an apocalyptic number.

It is an amenable number.

6645256541 is a deficient number, since it is larger than the sum of its proper divisors (1639738723).

6645256541 is a wasteful number, since it uses less digits than its factorization.

6645256541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86302051.

The product of its digits is 864000, while the sum is 44.

The square root of 6645256541 is about 81518.4429500466. The cubic root of 6645256541 is about 1880.0551271182.

The spelling of 6645256541 in words is "six billion, six hundred forty-five million, two hundred fifty-six thousand, five hundred forty-one".