74205661115550 has 192 divisors, whose sum is σ = 199630811810304. Its totient is φ = 18167832883200.

The previous prime is 74205661115539. The next prime is 74205661115639. The reversal of 74205661115550 is 5551116650247.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74205661115550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1037413887 + ... + 1037485413.

It is an arithmetic number, because the mean of its divisors is an integer number (1039743811512).

Almost surely, 2^{74205661115550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74205661115550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99815405905152).

74205661115550 is an abundant number, since it is smaller than the sum of its proper divisors (125425150694754).

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

74205661115550 is a wasteful number, since it uses less digits than its factorization.

74205661115550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81523 (or 81518 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 48.

Adding to 74205661115550 its reverse (5551116650247), we get a palindrome (79756777765797).

The spelling of 74205661115550 in words is "seventy-four trillion, two hundred five billion, six hundred sixty-one million, one hundred fifteen thousand, five hundred fifty".