66106615650 has 48 divisors (see below), whose sum is σ = 173588202144. Its totient is φ = 16591463680.

The previous prime is 66106615649. The next prime is 66106615661. The reversal of 66106615650 is 5651660166.

66106615650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12959532 + ... + 12964631.

It is an arithmetic number, because the mean of its divisors is an integer number (3616420878).

Almost surely, 2^66106615650 is an apocalyptic number.

66106615650 is an abundant number, since it is smaller than the sum of its proper divisors (107481586494).

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

66106615650 is a wasteful number, since it uses less digits than its factorization.

66106615650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25924195 (or 25924190 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66106615650 in words is "sixty-six billion, one hundred six million, six hundred fifteen thousand, six hundred fifty".