6601121161 has 4 divisors (see below), whose sum is σ = 6709336324. Its totient is φ = 6492906000.

The previous prime is 6601121159. The next prime is 6601121167. The reversal of 6601121161 is 1611211066.

6601121161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1611211066 = 2 ⋅805605533.

It can be written as a sum of positive squares in 2 ways, for example, as 909324025 + 5691797136 = 30155^2 + 75444^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601121161 - 2¹ = 6601121159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6601121167) 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, 54107490 + ... + 54107611.

It is an arithmetic number, because the mean of its divisors is an integer number (1677334081).

Almost surely, 2^6601121161 is an apocalyptic number.

6601121161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6601121161 is a deficient number, since it is larger than the sum of its proper divisors (108215163).

6601121161 is a wasteful number, since it uses less digits than its factorization.

6601121161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108215162.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 6601121161 is about 81247.2840222982. The cubic root of 6601121161 is about 1875.8836639252.

The spelling of 6601121161 in words is "six billion, six hundred one million, one hundred twenty-one thousand, one hundred sixty-one".