66557763663007 has 4 divisors (see below), whose sum is σ = 66574291544776. Its totient is φ = 66541235781240.

The previous prime is 66557763662989. The next prime is 66557763663091. The reversal of 66557763663007 is 70036636775566.

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 66557763663007 - 2⁷ = 66557763662879 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 (66557763663107) 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, 8263934844 + ... + 8263942897.

It is an arithmetic number, because the mean of its divisors is an integer number (16643572886194).

Almost surely, 2^{66557763663007} is an apocalyptic number.

66557763663007 is a deficient number, since it is larger than the sum of its proper divisors (16527881769).

66557763663007 is a wasteful number, since it uses less digits than its factorization.

66557763663007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16527881768.

The product of its (nonzero) digits is 600112800, while the sum is 67.

The spelling of 66557763663007 in words is "sixty-six trillion, five hundred fifty-seven billion, seven hundred sixty-three million, six hundred sixty-three thousand, seven".