1686471380639 has 2 divisors, whose sum is σ = 1686471380640. Its totient is φ = 1686471380638.

The previous prime is 1686471380597. The next prime is 1686471380687. The reversal of 1686471380639 is 9360831746861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1686471380639 - 2³² = 1682176413343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1686471382639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843235690319 + 843235690320.

It is an arithmetic number, because the mean of its divisors is an integer number (843235690320).

Almost surely, 2^{1686471380639} is an apocalyptic number.

1686471380639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686471380639 is an equidigital number, since it uses as much as digits as its factorization.

1686471380639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 1686471380639 in words is "one trillion, six hundred eighty-six billion, four hundred seventy-one million, three hundred eighty thousand, six hundred thirty-nine".