1665422646 has 64 divisors (see below), whose sum is σ = 3583180800. Its totient is φ = 514190336.

The previous prime is 1665422597. The next prime is 1665422653. The reversal of 1665422646 is 6462245661.

It is a junction number, because it is equal to n+sod(n) for n = 1665422598 and 1665422607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3476635 + ... + 3477113.

It is an arithmetic number, because the mean of its divisors is an integer number (55987200).

Almost surely, 2^1665422646 is an apocalyptic number.

1665422646 is an abundant number, since it is smaller than the sum of its proper divisors (1917758154).

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

1665422646 is a wasteful number, since it uses less digits than its factorization.

1665422646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its digits is 414720, while the sum is 42.

The square root of 1665422646 is about 40809.5901229111. The cubic root of 1665422646 is about 1185.3360381529.

The spelling of 1665422646 in words is "one billion, six hundred sixty-five million, four hundred twenty-two thousand, six hundred forty-six".