667516639 has 2 divisors, whose sum is σ = 667516640. Its totient is φ = 667516638.

The previous prime is 667516561. The next prime is 667516669. The reversal of 667516639 is 936615766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667516639 - 2¹¹ = 667514591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667516592 and 667516601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667516669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333758319 + 333758320.

It is an arithmetic number, because the mean of its divisors is an integer number (333758320).

Almost surely, 2^667516639 is an apocalyptic number.

667516639 is a deficient number, since it is larger than the sum of its proper divisors (1).

667516639 is an equidigital number, since it uses as much as digits as its factorization.

667516639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 667516639 is about 25836.3433751760. The cubic root of 667516639 is about 873.9515666807.

The spelling of 667516639 in words is "six hundred sixty-seven million, five hundred sixteen thousand, six hundred thirty-nine".