6500601661 has 4 divisors (see below), whose sum is σ = 6882990012. Its totient is φ = 6118213312.

The previous prime is 6500601649. The next prime is 6500601671. The reversal of 6500601661 is 1661060056.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2310628761 + 4189972900 = 48069^2 + 64730^2 .

It is a cyclic number.

It is not a de Polignac number, because 6500601661 - 2⁵ = 6500601629 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 (6500601671) 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, 191194150 + ... + 191194183.

It is an arithmetic number, because the mean of its divisors is an integer number (1720747503).

Almost surely, 2^6500601661 is an apocalyptic number.

It is an amenable number.

6500601661 is a deficient number, since it is larger than the sum of its proper divisors (382388351).

6500601661 is a wasteful number, since it uses less digits than its factorization.

6500601661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382388350.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6500601661 is about 80626.3087397656. The cubic root of 6500601661 is about 1866.3131588473.

The spelling of 6500601661 in words is "six billion, five hundred million, six hundred one thousand, six hundred sixty-one".