6541812906 has 16 divisors (see below), whose sum is σ = 13089591264. Its totient is φ = 2179610064.

The previous prime is 6541812899. The next prime is 6541812911. The reversal of 6541812906 is 6092181456.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234241 + ... + 260676.

It is an arithmetic number, because the mean of its divisors is an integer number (818099454).

Almost surely, 2^6541812906 is an apocalyptic number.

6541812906 is an abundant number, since it is smaller than the sum of its proper divisors (6547778358).

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

6541812906 is a wasteful number, since it uses less digits than its factorization.

6541812906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497125.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 6541812906 is about 80881.4744301809. The cubic root of 6541812906 is about 1870.2487497362.

It can be divided in two parts, 654 and 1812906, that added together give a triangular number (1813560 = T₁₉₀₄).

The spelling of 6541812906 in words is "six billion, five hundred forty-one million, eight hundred twelve thousand, nine hundred six".