6535199861 has 4 divisors (see below), whose sum is σ = 6537148800. Its totient is φ = 6533250924.

The previous prime is 6535199843. The next prime is 6535199873. The reversal of 6535199861 is 1689915356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6535199861 - 2¹⁴ = 6535183477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6535199831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969431 + ... + 976148.

It is an arithmetic number, because the mean of its divisors is an integer number (1634287200).

Almost surely, 2^6535199861 is an apocalyptic number.

It is an amenable number.

6535199861 is a deficient number, since it is larger than the sum of its proper divisors (1948939).

6535199861 is a wasteful number, since it uses less digits than its factorization.

6535199861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948938.

The product of its digits is 1749600, while the sum is 53.

The square root of 6535199861 is about 80840.5830075464. The cubic root of 6535199861 is about 1869.6183327945.

The spelling of 6535199861 in words is "six billion, five hundred thirty-five million, one hundred ninety-nine thousand, eight hundred sixty-one".