66607655650 has 12 divisors (see below), whose sum is σ = 123890239602. Its totient is φ = 26643062240.

The previous prime is 66607655593. The next prime is 66607655669. The reversal of 66607655650 is 5655670666.

It can be written as a sum of positive squares in 3 ways, for example, as 36066947569 + 30540708081 = 189913^2 + 174759^2 .

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, 666076507 + ... + 666076606.

Almost surely, 2^66607655650 is an apocalyptic number.

66607655650 is a deficient number, since it is larger than the sum of its proper divisors (57282583952).

66607655650 is a wasteful number, since it uses less digits than its factorization.

66607655650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332153125 (or 1332153120 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 52.

The spelling of 66607655650 in words is "sixty-six billion, six hundred seven million, six hundred fifty-five thousand, six hundred fifty".