1681243816 has 32 divisors (see below), whose sum is σ = 3607490880. Its totient is φ = 719568000.

The previous prime is 1681243807. The next prime is 1681243819. The reversal of 1681243816 is 6183421861.

It is not an unprimeable number, because it can be changed into a prime (1681243819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22891 + ... + 62341.

It is an arithmetic number, because the mean of its divisors is an integer number (112734090).

Almost surely, 2^1681243816 is an apocalyptic number.

It is an amenable number.

1681243816 is an abundant number, since it is smaller than the sum of its proper divisors (1926247064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681243816 is a wasteful number, since it uses less digits than its factorization.

1681243816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40225 (or 40221 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 1681243816 is about 41002.9732580456. The cubic root of 1681243816 is about 1189.0776969586.

The spelling of 1681243816 in words is "one billion, six hundred eighty-one million, two hundred forty-three thousand, eight hundred sixteen".