694206687209081 has 2 divisors, whose sum is σ = 694206687209082. Its totient is φ = 694206687209080.

The previous prime is 694206687209041. The next prime is 694206687209107. The reversal of 694206687209081 is 180902786602496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529739938566400 + 164466748642681 = 23016080^2 + 12824459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-694206687209081 is a prime.

It is a super-2 number, since 2×694206687209081² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (694206687209041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347103343604540 + 347103343604541.

It is an arithmetic number, because the mean of its divisors is an integer number (347103343604541).

Almost surely, 2^{694206687209081} is an apocalyptic number.

It is an amenable number.

694206687209081 is a deficient number, since it is larger than the sum of its proper divisors (1).

694206687209081 is an equidigital number, since it uses as much as digits as its factorization.

694206687209081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 694206687209081 in words is "six hundred ninety-four trillion, two hundred six billion, six hundred eighty-seven million, two hundred nine thousand, eighty-one".