6540619594 has 4 divisors (see below), whose sum is σ = 9810929394. Its totient is φ = 3270309796.

The previous prime is 6540619577. The next prime is 6540619607. The reversal of 6540619594 is 4959160456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6539148225 + 1471369 = 80865^2 + 1213^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 1635154897 + ... + 1635154900.

Almost surely, 2^6540619594 is an apocalyptic number.

6540619594 is a deficient number, since it is larger than the sum of its proper divisors (3270309800).

6540619594 is a wasteful number, since it uses less digits than its factorization.

6540619594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270309799.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 6540619594 is about 80874.0971757954. The cubic root of 6540619594 is about 1870.1350235656.

The spelling of 6540619594 in words is "six billion, five hundred forty million, six hundred nineteen thousand, five hundred ninety-four".