115577081550 has 504 divisors, whose sum is σ = 378185511096. Its totient is φ = 26189412480.

The previous prime is 115577081531. The next prime is 115577081617. The reversal of 115577081550 is 55180775511.

115577081550 is a `hidden beast` number, since 1 + 15 + 5 + 7 + 7 + 0 + 81 + 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 = 115577081496 and 115577081505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 291125952 + ... + 291126348.

Almost surely, 2^115577081550 is an apocalyptic number.

115577081550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 115577081550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189092755548).

115577081550 is an abundant number, since it is smaller than the sum of its proper divisors (262608429546).

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

115577081550 is a wasteful number, since it uses less digits than its factorization.

115577081550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 245000, while the sum is 45.

The spelling of 115577081550 in words is "one hundred fifteen billion, five hundred seventy-seven million, eighty-one thousand, five hundred fifty".