1665066720 has 48 divisors (see below), whose sum is σ = 5244961680. Its totient is φ = 444017664.

The previous prime is 1665066701. The next prime is 1665066727. The reversal of 1665066720 is 276605661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665066727) 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, 1733965 + ... + 1734924.

It is an arithmetic number, because the mean of its divisors is an integer number (109270035).

Almost surely, 2^1665066720 is an apocalyptic number.

1665066720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665066720 is an abundant number, since it is smaller than the sum of its proper divisors (3579894960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665066720 is a wasteful number, since it uses less digits than its factorization.

1665066720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468907 (or 3468899 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 1665066720 is about 40805.2290766759. The cubic root of 1665066720 is about 1185.2515907256.

The spelling of 1665066720 in words is "one billion, six hundred sixty-five million, sixty-six thousand, seven hundred twenty".