667735657054547 has 4 divisors (see below), whose sum is σ = 667740968007816. Its totient is φ = 667730346101280.

The previous prime is 667735657054489. The next prime is 667735657054549. The reversal of 667735657054547 is 745450756537766.

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 667735657054547 - 2⁴⁸ = 386260680343891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667735657054549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2655288038 + ... + 2655539499.

It is an arithmetic number, because the mean of its divisors is an integer number (166935242001954).

Almost surely, 2^{667735657054547} is an apocalyptic number.

667735657054547 is a deficient number, since it is larger than the sum of its proper divisors (5310953269).

667735657054547 is a wasteful number, since it uses less digits than its factorization.

667735657054547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310953268.

The product of its (nonzero) digits is 15558480000, while the sum is 77.

The spelling of 667735657054547 in words is "six hundred sixty-seven trillion, seven hundred thirty-five billion, six hundred fifty-seven million, fifty-four thousand, five hundred forty-seven".