667975897787 has 4 divisors (see below), whose sum is σ = 728700979416. Its totient is φ = 607250816160.

The previous prime is 667975897741. The next prime is 667975897811. The reversal of 667975897787 is 787798579766.

It is a happy number.

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 667975897787 - 2⁶ = 667975897723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667975897699 and 667975897708.

It is not an unprimeable number, because it can be changed into a prime (667975897727) 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, 30362540798 + ... + 30362540819.

It is an arithmetic number, because the mean of its divisors is an integer number (182175244854).

Almost surely, 2^667975897787 is an apocalyptic number.

667975897787 is a deficient number, since it is larger than the sum of its proper divisors (60725081629).

667975897787 is a wasteful number, since it uses less digits than its factorization.

667975897787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60725081628.

The product of its digits is 15682947840, while the sum is 86.

The spelling of 667975897787 in words is "six hundred sixty-seven billion, nine hundred seventy-five million, eight hundred ninety-seven thousand, seven hundred eighty-seven".