1686944945594 has 4 divisors (see below), whose sum is σ = 2530417418394. Its totient is φ = 843472472796.

The previous prime is 1686944945573. The next prime is 1686944945663. The reversal of 1686944945594 is 4955494496861.

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

It can be written as a sum of positive squares in only one way, i.e., 1243142491369 + 443802454225 = 1114963^2 + 666185^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421736236397 + ... + 421736236400.

Almost surely, 2^{1686944945594} is an apocalyptic number.

1686944945594 is a deficient number, since it is larger than the sum of its proper divisors (843472472800).

1686944945594 is an equidigital number, since it uses as much as digits as its factorization.

1686944945594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843472472799.

The product of its digits is 1343692800, while the sum is 74.

The spelling of 1686944945594 in words is "one trillion, six hundred eighty-six billion, nine hundred forty-four million, nine hundred forty-five thousand, five hundred ninety-four".