1664765375 has 64 divisors (see below), whose sum is σ = 2707810560. Its totient is φ = 991641600.

The previous prime is 1664765371. The next prime is 1664765437. The reversal of 1664765375 is 5735674661.

It is not a de Polignac number, because 1664765375 - 2² = 1664765371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664765371) 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 63 ways as a sum of consecutive naturals, for example, 189071 + ... + 197679.

It is an arithmetic number, because the mean of its divisors is an integer number (42309540).

Almost surely, 2^1664765375 is an apocalyptic number.

1664765375 is a deficient number, since it is larger than the sum of its proper divisors (1043045185).

1664765375 is a wasteful number, since it uses less digits than its factorization.

1664765375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8661 (or 8651 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 50.

The square root of 1664765375 is about 40801.5364294042. The cubic root of 1664765375 is about 1185.1800838434.

The spelling of 1664765375 in words is "one billion, six hundred sixty-four million, seven hundred sixty-five thousand, three hundred seventy-five".