1687686460631 has 2 divisors, whose sum is σ = 1687686460632. Its totient is φ = 1687686460630.

The previous prime is 1687686460597. The next prime is 1687686460633. The reversal of 1687686460631 is 1360646867861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1687686460631 - 2¹⁸ = 1687686198487 is a prime.

It is a super-2 number, since 2×1687686460631² (a number of 25 digits) contains 22 as substring.

Together with 1687686460633, 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 (1687686460633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843843230315 + 843843230316.

It is an arithmetic number, because the mean of its divisors is an integer number (843843230316).

Almost surely, 2^{1687686460631} is an apocalyptic number.

1687686460631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687686460631 is an equidigital number, since it uses as much as digits as its factorization.

1687686460631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 62.

The spelling of 1687686460631 in words is "one trillion, six hundred eighty-seven billion, six hundred eighty-six million, four hundred sixty thousand, six hundred thirty-one".