67668136591 has 32 divisors (see below), whose sum is σ = 79057161216. Its totient is φ = 57238272000.

The previous prime is 67668136583. The next prime is 67668136603. The reversal of 67668136591 is 19563186676.

It is a cyclic number.

It is not a de Polignac number, because 67668136591 - 2³ = 67668136583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67668136531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6633591 + ... + 6643783.

It is an arithmetic number, because the mean of its divisors is an integer number (2470536288).

Almost surely, 2^67668136591 is an apocalyptic number.

67668136591 is a deficient number, since it is larger than the sum of its proper divisors (11389024625).

67668136591 is a wasteful number, since it uses less digits than its factorization.

67668136591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10623.

The product of its digits is 9797760, while the sum is 58.

The spelling of 67668136591 in words is "sixty-seven billion, six hundred sixty-eight million, one hundred thirty-six thousand, five hundred ninety-one".