1664771161 has 8 divisors (see below), whose sum is σ = 1702750464. Its totient is φ = 1626898560.

The previous prime is 1664771159. The next prime is 1664771167. The reversal of 1664771161 is 1611774661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664771161 - 2¹ = 1664771159 is a prime.

It is a super-3 number, since 3×1664771161³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664771167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5316 + ... + 57946.

It is an arithmetic number, because the mean of its divisors is an integer number (212843808).

Almost surely, 2^1664771161 is an apocalyptic number.

It is an amenable number.

1664771161 is a deficient number, since it is larger than the sum of its proper divisors (37979303).

1664771161 is an equidigital number, since it uses as much as digits as its factorization.

1664771161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53351.

The product of its digits is 42336, while the sum is 40.

The square root of 1664771161 is about 40801.6073335353. The cubic root of 1664771161 is about 1185.1814568985.

The spelling of 1664771161 in words is "one billion, six hundred sixty-four million, seven hundred seventy-one thousand, one hundred sixty-one".