77163533550 has 192 divisors, whose sum is σ = 214569600000. Its totient is φ = 20390071680.

The previous prime is 77163533549. The next prime is 77163533581. The reversal of 77163533550 is 5533536177.

77163533550 is a `hidden beast` number, since 7 + 7 + 1 + 63 + 5 + 33 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 77163533496 and 77163533505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 93758439 + ... + 93759261.

It is an arithmetic number, because the mean of its divisors is an integer number (1117550000).

Almost surely, 2^77163533550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77163533550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107284800000).

77163533550 is an abundant number, since it is smaller than the sum of its proper divisors (137406066450).

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

77163533550 is a wasteful number, since it uses less digits than its factorization.

77163533550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 992250, while the sum is 45.

The spelling of 77163533550 in words is "seventy-seven billion, one hundred sixty-three million, five hundred thirty-three thousand, five hundred fifty".