688197928321 has 2 divisors, whose sum is σ = 688197928322. Its totient is φ = 688197928320.

The previous prime is 688197928283. The next prime is 688197928337. The reversal of 688197928321 is 123829791886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669182897296 + 19015031025 = 818036^2 + 137895^2 .

It is a cyclic number.

It is not a de Polignac number, because 688197928321 - 2¹⁹ = 688197404033 is a prime.

It is not a weakly prime, because it can be changed into another prime (688197928361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344098964160 + 344098964161.

It is an arithmetic number, because the mean of its divisors is an integer number (344098964161).

Almost surely, 2^688197928321 is an apocalyptic number.

It is an amenable number.

688197928321 is a deficient number, since it is larger than the sum of its proper divisors (1).

688197928321 is an equidigital number, since it uses as much as digits as its factorization.

688197928321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 64.

The spelling of 688197928321 in words is "six hundred eighty-eight billion, one hundred ninety-seven million, nine hundred twenty-eight thousand, three hundred twenty-one".