688238364091 has 2 divisors, whose sum is σ = 688238364092. Its totient is φ = 688238364090.

The previous prime is 688238364017. The next prime is 688238364109. The reversal of 688238364091 is 190463832886.

Together with next prime (688238364109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688238364091 - 2¹³ = 688238355899 is a prime.

It is not a weakly prime, because it can be changed into another prime (688230364091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344119182045 + 344119182046.

It is an arithmetic number, because the mean of its divisors is an integer number (344119182046).

Almost surely, 2^688238364091 is an apocalyptic number.

688238364091 is a deficient number, since it is larger than the sum of its proper divisors (1).

688238364091 is an equidigital number, since it uses as much as digits as its factorization.

688238364091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11943936, while the sum is 58.

The spelling of 688238364091 in words is "six hundred eighty-eight billion, two hundred thirty-eight million, three hundred sixty-four thousand, ninety-one".