66638553530667 has 8 divisors (see below), whose sum is σ = 88872934020096. Its totient is φ = 44414937697512.

The previous prime is 66638553530663. The next prime is 66638553530669. The reversal of 66638553530667 is 76603535583666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66638553530667 - 2² = 66638553530663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66638553530663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691149623 + ... + 2691174384.

It is an arithmetic number, because the mean of its divisors is an integer number (11109116752512).

Almost surely, 2^{66638553530667} is an apocalyptic number.

66638553530667 is a deficient number, since it is larger than the sum of its proper divisors (22234380489429).

66638553530667 is a wasteful number, since it uses less digits than its factorization.

66638553530667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382328137.

The product of its (nonzero) digits is 1469664000, while the sum is 69.

The spelling of 66638553530667 in words is "sixty-six trillion, six hundred thirty-eight billion, five hundred fifty-three million, five hundred thirty thousand, six hundred sixty-seven".