694323661 has 2 divisors, whose sum is σ = 694323662. Its totient is φ = 694323660.

The previous prime is 694323629. The next prime is 694323683. The reversal of 694323661 is 166323496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559322500 + 135001161 = 23650^2 + 11619^2 .

It is a cyclic number.

It is not a de Polignac number, because 694323661 - 2⁵ = 694323629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (694323601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347161830 + 347161831.

It is an arithmetic number, because the mean of its divisors is an integer number (347161831).

Almost surely, 2^694323661 is an apocalyptic number.

It is an amenable number.

694323661 is a deficient number, since it is larger than the sum of its proper divisors (1).

694323661 is an equidigital number, since it uses as much as digits as its factorization.

694323661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 694323661 is about 26350.0220303513. The cubic root of 694323661 is about 885.4974640505.

The spelling of 694323661 in words is "six hundred ninety-four million, three hundred twenty-three thousand, six hundred sixty-one".