1213533784816 has 20 divisors (see below), whose sum is σ = 2351486552272. Its totient is φ = 606698545536.

The previous prime is 1213533784807. The next prime is 1213533784831. The reversal of 1213533784816 is 6184873353121.

It is a congruent number.

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, 4125045 + ... + 4409428.

Almost surely, 2^{1213533784816} is an apocalyptic number.

1213533784816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213533784816 is a deficient number, since it is larger than the sum of its proper divisors (1137952767456).

1213533784816 is an equidigital number, since it uses as much as digits as its factorization.

1213533784816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8543368 (or 8543362 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 1213533784816 in words is "one trillion, two hundred thirteen billion, five hundred thirty-three million, seven hundred eighty-four thousand, eight hundred sixteen".