669636587 has 2 divisors, whose sum is σ = 669636588. Its totient is φ = 669636586.

The previous prime is 669636577. The next prime is 669636631. The reversal of 669636587 is 785636966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669636587 - 2⁶ = 669636523 is a prime.

It is not a weakly prime, because it can be changed into another prime (669636547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334818293 + 334818294.

It is an arithmetic number, because the mean of its divisors is an integer number (334818294).

Almost surely, 2^669636587 is an apocalyptic number.

669636587 is a deficient number, since it is larger than the sum of its proper divisors (1).

669636587 is an equidigital number, since it uses as much as digits as its factorization.

669636587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 56.

The square root of 669636587 is about 25877.3373243848. The cubic root of 669636587 is about 874.8757753441.

The spelling of 669636587 in words is "six hundred sixty-nine million, six hundred thirty-six thousand, five hundred eighty-seven".