1664446903 has 8 divisors (see below), whose sum is σ = 1902993408. Its totient is φ = 1426092504.

The previous prime is 1664446853. The next prime is 1664446921. The reversal of 1664446903 is 3096444661.

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 1664446903 - 2²⁹ = 1127575991 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 1664446903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664446943) 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, 28951 + ... + 64552.

It is an arithmetic number, because the mean of its divisors is an integer number (237874176).

Almost surely, 2^1664446903 is an apocalyptic number.

1664446903 is a deficient number, since it is larger than the sum of its proper divisors (238546505).

1664446903 is an equidigital number, since it uses as much as digits as its factorization.

1664446903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96053.

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 1664446903 is about 40797.6335465674. The cubic root of 1664446903 is about 1185.1045034746.

The spelling of 1664446903 in words is "one billion, six hundred sixty-four million, four hundred forty-six thousand, nine hundred three".