6540852661 has 6 divisors (see below), whose sum is σ = 7608747030. Its totient is φ = 5606445096.

The previous prime is 6540852653. The next prime is 6540852691. The reversal of 6540852661 is 1662580456.

It can be written as a sum of positive squares in only one way, i.e., 5599528900 + 941323761 = 74830^2 + 30681^2 .

It is not a de Polignac number, because 6540852661 - 2³ = 6540852653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540852691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66743346 + ... + 66743443.

It is an arithmetic number, because the mean of its divisors is an integer number (1268124505).

Almost surely, 2^6540852661 is an apocalyptic number.

It is an amenable number.

6540852661 is a deficient number, since it is larger than the sum of its proper divisors (1067894369).

6540852661 is a wasteful number, since it uses less digits than its factorization.

6540852661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133486803 (or 133486796 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 6540852661 is about 80875.5380878545. The cubic root of 6540852661 is about 1870.1572366284.

The spelling of 6540852661 in words is "six billion, five hundred forty million, eight hundred fifty-two thousand, six hundred sixty-one".