1686616786747 has 4 divisors (see below), whose sum is σ = 1744775986320. Its totient is φ = 1628457587176.

The previous prime is 1686616786711. The next prime is 1686616786753. The reversal of 1686616786747 is 7476876166861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1686616786747 - 2¹⁹ = 1686616262459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686616786747.

It is not an unprimeable number, because it can be changed into a prime (1686616781747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29079599743 + ... + 29079599800.

It is an arithmetic number, because the mean of its divisors is an integer number (436193996580).

Almost surely, 2^{1686616786747} is an apocalyptic number.

1686616786747 is a deficient number, since it is larger than the sum of its proper divisors (58159199573).

1686616786747 is an equidigital number, since it uses as much as digits as its factorization.

1686616786747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58159199572.

The product of its digits is 682795008, while the sum is 73.

The spelling of 1686616786747 in words is "one trillion, six hundred eighty-six billion, six hundred sixteen million, seven hundred eighty-six thousand, seven hundred forty-seven".