1993816883947 has 16 divisors (see below), whose sum is σ = 2357287695360. Its totient is φ = 1650009318048.

The previous prime is 1993816883941. The next prime is 1993816883959. The reversal of 1993816883947 is 7493886183991.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1993816883947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993816883941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8492818 + ... + 8724424.

It is an arithmetic number, because the mean of its divisors is an integer number (147330480960).

Almost surely, 2^{1993816883947} is an apocalyptic number.

1993816883947 is a deficient number, since it is larger than the sum of its proper divisors (363470811413).

1993816883947 is a wasteful number, since it uses less digits than its factorization.

1993816883947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274050.

The product of its digits is 564350976, while the sum is 76.

The spelling of 1993816883947 in words is "one trillion, nine hundred ninety-three billion, eight hundred sixteen million, eight hundred eighty-three thousand, nine hundred forty-seven".