6400616161 has 4 divisors (see below), whose sum is σ = 6777123012. Its totient is φ = 6024109312.

The previous prime is 6400616153. The next prime is 6400616191. The reversal of 6400616161 is 1616160046.

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 2086753761 + 4313862400 = 45681^2 + 65680^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400616161 - 2³ = 6400616153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400616191) 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, 188253400 + ... + 188253433.

It is an arithmetic number, because the mean of its divisors is an integer number (1694280753).

Almost surely, 2^6400616161 is an apocalyptic number.

It is an amenable number.

6400616161 is a deficient number, since it is larger than the sum of its proper divisors (376506851).

6400616161 is a wasteful number, since it uses less digits than its factorization.

6400616161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376506850.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 6400616161 is about 80003.8509135654. The cubic root of 6400616161 is about 1856.6951141585.

The spelling of 6400616161 in words is "six billion, four hundred million, six hundred sixteen thousand, one hundred sixty-one".