687061719397 has 2 divisors, whose sum is σ = 687061719398. Its totient is φ = 687061719396.

The previous prime is 687061719389. The next prime is 687061719419. The reversal of 687061719397 is 793917160786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686190229956 + 871489441 = 828366^2 + 29521^2 .

It is a cyclic number.

It is not a de Polignac number, because 687061719397 - 2³ = 687061719389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687061719367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343530859698 + 343530859699.

It is an arithmetic number, because the mean of its divisors is an integer number (343530859699).

Almost surely, 2^687061719397 is an apocalyptic number.

It is an amenable number.

687061719397 is a deficient number, since it is larger than the sum of its proper divisors (1).

687061719397 is an equidigital number, since it uses as much as digits as its factorization.

687061719397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24004512, while the sum is 64.

The spelling of 687061719397 in words is "six hundred eighty-seven billion, sixty-one million, seven hundred nineteen thousand, three hundred ninety-seven".