68540207671 has 18 divisors (see below), whose sum is σ = 76633413792. Its totient is φ = 61210056960.

The previous prime is 68540207647. The next prime is 68540207711. The reversal of 68540207671 is 17670204586.

It is a happy number.

It is not a de Polignac number, because 68540207671 - 2⁷ = 68540207543 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68540204671) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18947655 + ... + 18951271.

Almost surely, 2^68540207671 is an apocalyptic number.

68540207671 is a deficient number, since it is larger than the sum of its proper divisors (8093206121).

68540207671 is an frugal number, since it uses more digits than its factorization.

68540207671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7291 (or 3661 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 68540207671 in words is "sixty-eight billion, five hundred forty million, two hundred seven thousand, six hundred seventy-one".