1664350881 has 8 divisors (see below), whose sum is σ = 2349671904. Its totient is φ = 1044298560.

The previous prime is 1664350873. The next prime is 1664350931. The reversal of 1664350881 is 1880534661.

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

It is not a de Polignac number, because 1664350881 - 2³ = 1664350873 is a prime.

It is a super-2 number, since 2×1664350881² = 5540127710170952322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664350811) 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 7 ways as a sum of consecutive naturals, for example, 16317115 + ... + 16317216.

It is an arithmetic number, because the mean of its divisors is an integer number (293708988).

Almost surely, 2^1664350881 is an apocalyptic number.

It is an amenable number.

1664350881 is a deficient number, since it is larger than the sum of its proper divisors (685321023).

1664350881 is a wasteful number, since it uses less digits than its factorization.

1664350881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32634351.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 1664350881 is about 40796.4567211418. The cubic root of 1664350881 is about 1185.0817134629.

The spelling of 1664350881 in words is "one billion, six hundred sixty-four million, three hundred fifty thousand, eight hundred eighty-one".