1665065643 has 8 divisors (see below), whose sum is σ = 2220288000. Its totient is φ = 1109943528.

The previous prime is 1665065639. The next prime is 1665065669. The reversal of 1665065643 is 3465605661.

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

It is not a de Polignac number, because 1665065643 - 2² = 1665065639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665065595 and 1665065604.

It is not an unprimeable number, because it can be changed into a prime (1665065683) 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, 32758 + ... + 66356.

It is an arithmetic number, because the mean of its divisors is an integer number (277536000).

Almost surely, 2^1665065643 is an apocalyptic number.

1665065643 is a deficient number, since it is larger than the sum of its proper divisors (555222357).

1665065643 is a wasteful number, since it uses less digits than its factorization.

1665065643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50121.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 1665065643 is about 40805.2158798358. The cubic root of 1665065643 is about 1185.2513351771.

The spelling of 1665065643 in words is "one billion, six hundred sixty-five million, sixty-five thousand, six hundred forty-three".