689145612427 has 2 divisors, whose sum is σ = 689145612428. Its totient is φ = 689145612426.

The previous prime is 689145612413. The next prime is 689145612473. The reversal of 689145612427 is 724216541986.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689145612427 is a prime.

It is not a weakly prime, because it can be changed into another prime (689145612497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344572806213 + 344572806214.

It is an arithmetic number, because the mean of its divisors is an integer number (344572806214).

Almost surely, 2^689145612427 is an apocalyptic number.

689145612427 is a deficient number, since it is larger than the sum of its proper divisors (1).

689145612427 is an equidigital number, since it uses as much as digits as its factorization.

689145612427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 55.

The spelling of 689145612427 in words is "six hundred eighty-nine billion, one hundred forty-five million, six hundred twelve thousand, four hundred twenty-seven".