1216799191930 has 32 divisors (see below), whose sum is σ = 2554214054400. Its totient is φ = 417188293200.

The previous prime is 1216799191921. The next prime is 1216799191931. The reversal of 1216799191930 is 391919976121.

It is not an unprimeable number, because it can be changed into a prime (1216799191931) 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, 177372546 + ... + 177379405.

It is an arithmetic number, because the mean of its divisors is an integer number (79819189200).

Almost surely, 2^{1216799191930} is an apocalyptic number.

1216799191930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216799191930 is an abundant number, since it is smaller than the sum of its proper divisors (1337414862470).

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

1216799191930 is an equidigital number, since it uses as much as digits as its factorization.

1216799191930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354751979 (or 354751965 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 58.

The spelling of 1216799191930 in words is "one trillion, two hundred sixteen billion, seven hundred ninety-nine million, one hundred ninety-one thousand, nine hundred thirty".