694206687209881 has 2 divisors, whose sum is σ = 694206687209882. Its totient is φ = 694206687209880.

The previous prime is 694206687209837. The next prime is 694206687209927. The reversal of 694206687209881 is 188902786602496.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399626447254281 + 294580239955600 = 19990659^2 + 17163340^2 .

It is a cyclic number.

It is not a de Polignac number, because 694206687209881 - 2²⁹ = 694206150338969 is a prime.

It is a super-2 number, since 2×694206687209881² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 694206687209798 and 694206687209807.

It is not a weakly prime, because it can be changed into another prime (694206687209081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347103343604940 + 347103343604941.

It is an arithmetic number, because the mean of its divisors is an integer number (347103343604941).

Almost surely, 2^{694206687209881} is an apocalyptic number.

It is an amenable number.

694206687209881 is a deficient number, since it is larger than the sum of its proper divisors (1).

694206687209881 is an equidigital number, since it uses as much as digits as its factorization.

694206687209881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1003290624, while the sum is 76.

The spelling of 694206687209881 in words is "six hundred ninety-four trillion, two hundred six billion, six hundred eighty-seven million, two hundred nine thousand, eight hundred eighty-one".