667687949786767 has 16 divisors (see below), whose sum is σ = 829906118862912. Its totient is φ = 523050074899200.

The previous prime is 667687949786743. The next prime is 667687949786791. The reversal of 667687949786767 is 767687949786766.

It is an interprime number because it is at equal distance from previous prime (667687949786743) and next prime (667687949786791).

It is a cyclic number.

It is not a de Polignac number, because 667687949786767 - 2¹⁵ = 667687949753999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667687949784767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36322912678 + ... + 36322931059.

It is an arithmetic number, because the mean of its divisors is an integer number (51869132428932).

Almost surely, 2^{667687949786767} is an apocalyptic number.

667687949786767 is a deficient number, since it is larger than the sum of its proper divisors (162218169076145).

667687949786767 is a wasteful number, since it uses less digits than its factorization.

667687949786767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72645843858.

The product of its digits is 2710013386752, while the sum is 103.

Subtracting 667687949786767 from its reverse (767687949786766), we obtain a palindrome (99999999999999).

The spelling of 667687949786767 in words is "six hundred sixty-seven trillion, six hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-six thousand, seven hundred sixty-seven".