1686618732545 has 16 divisors (see below), whose sum is σ = 2045020497408. Its totient is φ = 1335245867520.

The previous prime is 1686618732517. The next prime is 1686618732569. The reversal of 1686618732545 is 5452378166861.

It is not a de Polignac number, because 1686618732545 - 2¹⁴ = 1686618716161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4619330 + ... + 4971060.

It is an arithmetic number, because the mean of its divisors is an integer number (127813781088).

Almost surely, 2^{1686618732545} is an apocalyptic number.

It is an amenable number.

1686618732545 is a deficient number, since it is larger than the sum of its proper divisors (358401764863).

1686618732545 is an equidigital number, since it uses as much as digits as its factorization.

1686618732545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361720.

The product of its digits is 58060800, while the sum is 62.

The spelling of 1686618732545 in words is "one trillion, six hundred eighty-six billion, six hundred eighteen million, seven hundred thirty-two thousand, five hundred forty-five".