6545898661 has 4 divisors (see below), whose sum is σ = 6607075392. Its totient is φ = 6484721932.

The previous prime is 6545898641. The next prime is 6545898673. The reversal of 6545898661 is 1668985456.

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 6545898661 - 2⁵ = 6545898629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6545898596 and 6545898605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6545898641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30588205 + ... + 30588418.

It is an arithmetic number, because the mean of its divisors is an integer number (1651768848).

Almost surely, 2^6545898661 is an apocalyptic number.

It is an amenable number.

6545898661 is a deficient number, since it is larger than the sum of its proper divisors (61176731).

6545898661 is a wasteful number, since it uses less digits than its factorization.

6545898661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61176730.

The product of its digits is 12441600, while the sum is 58.

The square root of 6545898661 is about 80906.7281565631. The cubic root of 6545898661 is about 1870.6380295892.

The spelling of 6545898661 in words is "six billion, five hundred forty-five million, eight hundred ninety-eight thousand, six hundred sixty-one".