1687235321747 has 2 divisors, whose sum is σ = 1687235321748. Its totient is φ = 1687235321746.

The previous prime is 1687235321701. The next prime is 1687235321797. The reversal of 1687235321747 is 7471235327861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1687235321747 - 2⁸ = 1687235321491 is a prime.

It is a super-2 number, since 2×1687235321747² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1687235321692 and 1687235321701.

It is not a weakly prime, because it can be changed into another prime (1687235321797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843617660873 + 843617660874.

It is an arithmetic number, because the mean of its divisors is an integer number (843617660874).

Almost surely, 2^{1687235321747} is an apocalyptic number.

1687235321747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687235321747 is an equidigital number, since it uses as much as digits as its factorization.

1687235321747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 56.

The spelling of 1687235321747 in words is "one trillion, six hundred eighty-seven billion, two hundred thirty-five million, three hundred twenty-one thousand, seven hundred forty-seven".