1216778733380 has 48 divisors (see below), whose sum is σ = 2920398216960. Its totient is φ = 417162814848.

The previous prime is 1216778733367. The next prime is 1216778733413. The reversal of 1216778733380 is 833378776121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3194126 + ... + 3554714.

It is an arithmetic number, because the mean of its divisors is an integer number (60841629520).

Almost surely, 2^{1216778733380} is an apocalyptic number.

1216778733380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216778733380 is an abundant number, since it is smaller than the sum of its proper divisors (1703619483580).

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

1216778733380 is a wasteful number, since it uses less digits than its factorization.

1216778733380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384708 (or 384706 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 1216778733380 in words is "one trillion, two hundred sixteen billion, seven hundred seventy-eight million, seven hundred thirty-three thousand, three hundred eighty".