667757613549 has 32 divisors (see below), whose sum is σ = 989848387584. Its totient is φ = 397637115840.

The previous prime is 667757613547. The next prime is 667757613569. The reversal of 667757613549 is 945316757766.

It is not a de Polignac number, because 667757613549 - 2¹ = 667757613547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667757613549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667757613547) 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 31 ways as a sum of consecutive naturals, for example, 22093882 + ... + 22124084.

It is an arithmetic number, because the mean of its divisors is an integer number (30932762112).

Almost surely, 2^667757613549 is an apocalyptic number.

It is an amenable number.

667757613549 is a deficient number, since it is larger than the sum of its proper divisors (322090774035).

667757613549 is a wasteful number, since it uses less digits than its factorization.

667757613549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48537.

The product of its digits is 200037600, while the sum is 66.

The spelling of 667757613549 in words is "six hundred sixty-seven billion, seven hundred fifty-seven million, six hundred thirteen thousand, five hundred forty-nine".