1213547979168 has 288 divisors, whose sum is σ = 4332119500800. Its totient is φ = 314197221888.

The previous prime is 1213547979157. The next prime is 1213547979169. The reversal of 1213547979168 is 8619797453121.

1213547979168 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 547 + 9 + 79 + 16 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1213547979169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192253 + ... + 1569731.

It is an arithmetic number, because the mean of its divisors is an integer number (15042081600).

Almost surely, 2^{1213547979168} is an apocalyptic number.

1213547979168 is a gapful number since it is divisible by the number (18) 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 1213547979168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166059750400).

1213547979168 is an abundant number, since it is smaller than the sum of its proper divisors (3118571521632).

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

1213547979168 is a wasteful number, since it uses less digits than its factorization.

1213547979168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377544 (or 1377533 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The spelling of 1213547979168 in words is "one trillion, two hundred thirteen billion, five hundred forty-seven million, nine hundred seventy-nine thousand, one hundred sixty-eight".