1686930794761 has 3 divisors (see below), whose sum is σ = 1686932093581. Its totient is φ = 1686929495942.

The previous prime is 1686930794753. The next prime is 1686930794767. The reversal of 1686930794761 is 1674970396861.

The square root of 1686930794761 is 1298819.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1686930794761 - 2³ = 1686930794753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686930794767) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 649410 + ... + 1948228.

Almost surely, 2^{1686930794761} is an apocalyptic number.

1686930794761 is the 1298819-th square number.

1686930794761 is the 649410-th centered octagonal number.

It is an amenable number.

1686930794761 is a deficient number, since it is larger than the sum of its proper divisors (1298820).

1686930794761 is an frugal number, since it uses more digits than its factorization.

1686930794761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597638 (or 1298819 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 1686930794761 in words is "one trillion, six hundred eighty-six billion, nine hundred thirty million, seven hundred ninety-four thousand, seven hundred sixty-one".