78553111121010 has 192 divisors, whose sum is σ = 214170804881280. Its totient is φ = 19950139991040.

The previous prime is 78553111120963. The next prime is 78553111121011. The reversal of 78553111121010 is 1012111135587.

78553111121010 is a `hidden beast` number, since 7 + 8 + 5 + 531 + 1 + 1 + 12 + 101 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (78553111121011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 64466305 + ... + 65673515.

It is an arithmetic number, because the mean of its divisors is an integer number (1115472942090).

Almost surely, 2^{78553111121010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78553111121010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107085402440640).

78553111121010 is an abundant number, since it is smaller than the sum of its proper divisors (135617693760270).

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

78553111121010 is a wasteful number, since it uses less digits than its factorization.

78553111121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207593 (or 1207590 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 36.

Adding to 78553111121010 its reverse (1012111135587), we get a palindrome (79565222256597).

The spelling of 78553111121010 in words is "seventy-eight trillion, five hundred fifty-three billion, one hundred eleven million, one hundred twenty-one thousand, ten".