1216379453280 has 192 divisors, whose sum is σ = 3970965067776. Its totient is φ = 312652800000.

The previous prime is 1216379453239. The next prime is 1216379453287. The reversal of 1216379453280 is 823549736121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216379453287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3572040 + ... + 3897720.

It is an arithmetic number, because the mean of its divisors is an integer number (20682109728).

It is a 1-persistent number, because it is pandigital, but 2⋅1216379453280 = 2432758906560 is not.

Almost surely, 2^{1216379453280} is an apocalyptic number.

1216379453280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216379453280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985482533888).

1216379453280 is an abundant number, since it is smaller than the sum of its proper divisors (2754585614496).

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

1216379453280 is a wasteful number, since it uses less digits than its factorization.

1216379453280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325981 (or 325973 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 1216379453280 in words is "one trillion, two hundred sixteen billion, three hundred seventy-nine million, four hundred fifty-three thousand, two hundred eighty".