694331819989 has 2 divisors, whose sum is σ = 694331819990. Its totient is φ = 694331819988.

The previous prime is 694331819963. The next prime is 694331820043. The reversal of 694331819989 is 989918133496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528576983089 + 165754836900 = 727033^2 + 407130^2 .

It is a cyclic number.

It is not a de Polignac number, because 694331819989 - 2⁷ = 694331819861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694331819089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347165909994 + 347165909995.

It is an arithmetic number, because the mean of its divisors is an integer number (347165909995).

Almost surely, 2^694331819989 is an apocalyptic number.

It is an amenable number.

694331819989 is a deficient number, since it is larger than the sum of its proper divisors (1).

694331819989 is an equidigital number, since it uses as much as digits as its factorization.

694331819989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90699264, while the sum is 70.

The spelling of 694331819989 in words is "six hundred ninety-four billion, three hundred thirty-one million, eight hundred nineteen thousand, nine hundred eighty-nine".