675680639 has 2 divisors, whose sum is σ = 675680640. Its totient is φ = 675680638.

The previous prime is 675680633. The next prime is 675680651. The reversal of 675680639 is 936086576.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-675680639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (675680633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337840319 + 337840320.

It is an arithmetic number, because the mean of its divisors is an integer number (337840320).

Almost surely, 2^675680639 is an apocalyptic number.

675680639 is a deficient number, since it is larger than the sum of its proper divisors (1).

675680639 is an equidigital number, since it uses as much as digits as its factorization.

675680639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 675680639 is about 25993.8577167761. The cubic root of 675680639 is about 877.5000669367.

The spelling of 675680639 in words is "six hundred seventy-five million, six hundred eighty thousand, six hundred thirty-nine".