1665626064 has 40 divisors (see below), whose sum is σ = 4310661600. Its totient is φ = 554203008.

The previous prime is 1665626033. The next prime is 1665626069. The reversal of 1665626064 is 4606265661.

It is a happy number.

It is a super-2 number, since 2×1665626064² = 5548620370152264192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665626069) 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, 4414 + ... + 57885.

It is an arithmetic number, because the mean of its divisors is an integer number (107766540).

Almost surely, 2^1665626064 is an apocalyptic number.

It is an amenable number.

1665626064 is an abundant number, since it is smaller than the sum of its proper divisors (2645035536).

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

1665626064 is a wasteful number, since it uses less digits than its factorization.

1665626064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62867 (or 62861 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 1665626064 is about 40812.0823286438. The cubic root of 1665626064 is about 1185.3842959471.

The spelling of 1665626064 in words is "one billion, six hundred sixty-five million, six hundred twenty-six thousand, sixty-four".