664887709139 has 2 divisors, whose sum is σ = 664887709140. Its totient is φ = 664887709138.

The previous prime is 664887709099. The next prime is 664887709147. The reversal of 664887709139 is 931907788466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664887709139 - 2¹² = 664887705043 is a prime.

It is not a weakly prime, because it can be changed into another prime (664887709039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332443854569 + 332443854570.

It is an arithmetic number, because the mean of its divisors is an integer number (332443854570).

Almost surely, 2^664887709139 is an apocalyptic number.

664887709139 is a deficient number, since it is larger than the sum of its proper divisors (1).

664887709139 is an equidigital number, since it uses as much as digits as its factorization.

664887709139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109734912, while the sum is 68.

The spelling of 664887709139 in words is "six hundred sixty-four billion, eight hundred eighty-seven million, seven hundred nine thousand, one hundred thirty-nine".