1645668069 has 8 divisors (see below), whose sum is σ = 2194997760. Its totient is φ = 1096725216.

The previous prime is 1645668067. The next prime is 1645668091. The reversal of 1645668069 is 9608665461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1645668069 - 2¹ = 1645668067 is a prime.

It is a super-3 number, since 3×1645668069³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645668067) 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, 86632 + ... + 103905.

It is an arithmetic number, because the mean of its divisors is an integer number (274374720).

Almost surely, 2^1645668069 is an apocalyptic number.

It is an amenable number.

1645668069 is a deficient number, since it is larger than the sum of its proper divisors (549329691).

1645668069 is a wasteful number, since it uses less digits than its factorization.

1645668069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193419.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 1645668069 is about 40566.8345942840. The cubic root of 1645668069 is about 1180.6307240476.

The spelling of 1645668069 in words is "one billion, six hundred forty-five million, six hundred sixty-eight thousand, sixty-nine".