697663997 has 2 divisors, whose sum is σ = 697663998. Its totient is φ = 697663996.

The previous prime is 697663937. The next prime is 697663999. The reversal of 697663997 is 799366796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633327556 + 64336441 = 25166^2 + 8021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697663997 is a prime.

Together with 697663999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697663999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348831998 + 348831999.

It is an arithmetic number, because the mean of its divisors is an integer number (348831999).

Almost surely, 2^697663997 is an apocalyptic number.

It is an amenable number.

697663997 is a deficient number, since it is larger than the sum of its proper divisors (1).

697663997 is an equidigital number, since it uses as much as digits as its factorization.

697663997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 62.

The square root of 697663997 is about 26413.3299112399. The cubic root of 697663997 is about 886.9152122460.

The spelling of 697663997 in words is "six hundred ninety-seven million, six hundred sixty-three thousand, nine hundred ninety-seven".