1664076959 has 4 divisors (see below), whose sum is σ = 1664187504. Its totient is φ = 1663966416.

The previous prime is 1664076941. The next prime is 1664076983. The reversal of 1664076959 is 9596704661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9596704661 = 19 ⋅505089719.

It is a cyclic number.

It is not a de Polignac number, because 1664076959 - 2¹⁶ = 1664011423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1664076959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664076919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28307 + ... + 64260.

It is an arithmetic number, because the mean of its divisors is an integer number (416046876).

Almost surely, 2^1664076959 is an apocalyptic number.

1664076959 is a deficient number, since it is larger than the sum of its proper divisors (110545).

1664076959 is an equidigital number, since it uses as much as digits as its factorization.

1664076959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110544.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 1664076959 is about 40793.0994041884. The cubic root of 1664076959 is about 1185.0166955697.

The spelling of 1664076959 in words is "one billion, six hundred sixty-four million, seventy-six thousand, nine hundred fifty-nine".