1660665650 has 48 divisors (see below), whose sum is σ = 3534148800. Its totient is φ = 568718400.

The previous prime is 1660665649. The next prime is 1660665659. The reversal of 1660665650 is 565660661.

It is a junction number, because it is equal to n+sod(n) for n = 1660665598 and 1660665607.

It is not an unprimeable number, because it can be changed into a prime (1660665659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379676 + ... + 384024.

It is an arithmetic number, because the mean of its divisors is an integer number (73628100).

Almost surely, 2^1660665650 is an apocalyptic number.

1660665650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1660665650 is an abundant number, since it is smaller than the sum of its proper divisors (1873483150).

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

1660665650 is a wasteful number, since it uses less digits than its factorization.

1660665650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459 (or 5454 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 1660665650 is about 40751.2656245177. The cubic root of 1660665650 is about 1184.2063917846.

The spelling of 1660665650 in words is "one billion, six hundred sixty million, six hundred sixty-five thousand, six hundred fifty".