77830555502550 has 48 divisors (see below), whose sum is σ = 203178713319360. Its totient is φ = 19662456126240.

The previous prime is 77830555502489. The next prime is 77830555502617. The reversal of 77830555502550 is 5520555503877.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13654480572 + ... + 13654486271.

It is an arithmetic number, because the mean of its divisors is an integer number (4232889860820).

Almost surely, 2^{77830555502550} is an apocalyptic number.

77830555502550 is an abundant number, since it is smaller than the sum of its proper divisors (125348157816810).

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

77830555502550 is a wasteful number, since it uses less digits than its factorization.

77830555502550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27308966877 (or 27308966872 counting only the distinct ones).

The product of its (nonzero) digits is 36750000, while the sum is 57.

The spelling of 77830555502550 in words is "seventy-seven trillion, eight hundred thirty billion, five hundred fifty-five million, five hundred two thousand, five hundred fifty".