66606115650 has 48 divisors (see below), whose sum is σ = 165223800000. Its totient is φ = 17757261760.

The previous prime is 66606115637. The next prime is 66606115663. The reversal of 66606115650 is 5651160666.

It is an interprime number because it is at equal distance from previous prime (66606115637) and next prime (66606115663).

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, 581851 + ... + 686849.

It is an arithmetic number, because the mean of its divisors is an integer number (3442162500).

Almost surely, 2^66606115650 is an apocalyptic number.

66606115650 is an abundant number, since it is smaller than the sum of its proper divisors (98617684350).

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

66606115650 is a wasteful number, since it uses less digits than its factorization.

66606115650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109243 (or 109238 counting only the distinct ones).

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

The spelling of 66606115650 in words is "sixty-six billion, six hundred six million, one hundred fifteen thousand, six hundred fifty".