1213749918720 has 528 divisors, whose sum is σ = 4266071147520. Its totient is φ = 319042879488.

The previous prime is 1213749918691. The next prime is 1213749918803. The reversal of 1213749918720 is 278199473121.

1213749918720 is a `hidden beast` number, since 1 + 2 + 1 + 374 + 99 + 187 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1711917726 + ... + 1711918434.

Almost surely, 2^{1213749918720} is an apocalyptic number.

1213749918720 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 1213749918720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2133035573760).

1213749918720 is an abundant number, since it is smaller than the sum of its proper divisors (3052321228800).

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

1213749918720 is a wasteful number, since it uses less digits than its factorization.

1213749918720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 1213749918720 in words is "one trillion, two hundred thirteen billion, seven hundred forty-nine million, nine hundred eighteen thousand, seven hundred twenty".