6661068650 has 12 divisors (see below), whose sum is σ = 12389587782. Its totient is φ = 2664427440.

The previous prime is 6661068647. The next prime is 6661068677. The reversal of 6661068650 is 568601666.

It can be written as a sum of positive squares in 3 ways, for example, as 5903002561 + 758066089 = 76831^2 + 27533^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66610637 + ... + 66610736.

Almost surely, 2^6661068650 is an apocalyptic number.

6661068650 is a deficient number, since it is larger than the sum of its proper divisors (5728519132).

6661068650 is a wasteful number, since it uses less digits than its factorization.

6661068650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133221385 (or 133221380 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 6661068650 is about 81615.3701823376. The cubic root of 6661068650 is about 1881.5451167059.

The spelling of 6661068650 in words is "six billion, six hundred sixty-one million, sixty-eight thousand, six hundred fifty".