66610305206 has 4 divisors (see below), whose sum is σ = 99915457812. Its totient is φ = 33305152602.

The previous prime is 66610305193. The next prime is 66610305227. The reversal of 66610305206 is 60250301666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16652576300 + ... + 16652576303.

It is an arithmetic number, because the mean of its divisors is an integer number (24978864453).

Almost surely, 2^66610305206 is an apocalyptic number.

66610305206 is a deficient number, since it is larger than the sum of its proper divisors (33305152606).

66610305206 is a wasteful number, since it uses less digits than its factorization.

66610305206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33305152605.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 66610305206 in words is "sixty-six billion, six hundred ten million, three hundred five thousand, two hundred six".