1664012889 has 40 divisors (see below), whose sum is σ = 3099125568. Its totient is φ = 864419040.

The previous prime is 1664012879. The next prime is 1664012893. The reversal of 1664012889 is 9882104661.

1664012889 is a `hidden beast` number, since 166 + 401 + 2 + 8 + 89 = 666.

It is not a de Polignac number, because 1664012889 - 2⁴ = 1664012873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664012879) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 127162 + ... + 139635.

Almost surely, 2^1664012889 is an apocalyptic number.

It is an amenable number.

1664012889 is a deficient number, since it is larger than the sum of its proper divisors (1435112679).

1664012889 is a wasteful number, since it uses less digits than its factorization.

1664012889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266827 (or 266818 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1664012889 is about 40792.3140922405. The cubic root of 1664012889 is about 1185.0014869393.

The spelling of 1664012889 in words is "one billion, six hundred sixty-four million, twelve thousand, eight hundred eighty-nine".