66557015207 has 4 divisors (see below), whose sum is σ = 66708626160. Its totient is φ = 66405404256.

The previous prime is 66557015183. The next prime is 66557015269. The reversal of 66557015207 is 70251075566.

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

It is a cyclic number.

It is not a de Polignac number, because 66557015207 - 2¹² = 66557011111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557014207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75804818 + ... + 75805695.

It is an arithmetic number, because the mean of its divisors is an integer number (16677156540).

Almost surely, 2^66557015207 is an apocalyptic number.

66557015207 is a deficient number, since it is larger than the sum of its proper divisors (151610953).

66557015207 is a wasteful number, since it uses less digits than its factorization.

66557015207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151610952.

The product of its (nonzero) digits is 441000, while the sum is 44.

The spelling of 66557015207 in words is "sixty-six billion, five hundred fifty-seven million, fifteen thousand, two hundred seven".