667645504365641 has 8 divisors (see below), whose sum is σ = 692316134899200. Its totient is φ = 643084765282960.

The previous prime is 667645504365613. The next prime is 667645504365677. The reversal of 667645504365641 is 146563405546766.

It is a happy number.

667645504365641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 667645504365641 - 2¹⁸ = 667645504103497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667645504367641) 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, 27472850345 + ... + 27472874646.

It is an arithmetic number, because the mean of its divisors is an integer number (86539516862400).

Almost surely, 2^{667645504365641} is an apocalyptic number.

It is an amenable number.

667645504365641 is a deficient number, since it is larger than the sum of its proper divisors (24670630533559).

667645504365641 is a wasteful number, since it uses less digits than its factorization.

667645504365641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54945725439.

The product of its (nonzero) digits is 1306368000, while the sum is 68.

The spelling of 667645504365641 in words is "six hundred sixty-seven trillion, six hundred forty-five billion, five hundred four million, three hundred sixty-five thousand, six hundred forty-one".