1681868546 has 8 divisors (see below), whose sum is σ = 2581472784. Its totient is φ = 821377620.

The previous prime is 1681868483. The next prime is 1681868561. The reversal of 1681868546 is 6458681861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9778220 + ... + 9778391.

It is an arithmetic number, because the mean of its divisors is an integer number (322684098).

Almost surely, 2^1681868546 is an apocalyptic number.

1681868546 is a deficient number, since it is larger than the sum of its proper divisors (899604238).

1681868546 is a wasteful number, since it uses less digits than its factorization.

1681868546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19556656.

The product of its digits is 2211840, while the sum is 53.

The square root of 1681868546 is about 41010.5906565609. The cubic root of 1681868546 is about 1189.2249610477.

The spelling of 1681868546 in words is "one billion, six hundred eighty-one million, eight hundred sixty-eight thousand, five hundred forty-six".