165581127500 has 30 divisors (see below), whose sum is σ = 362092815084. Its totient is φ = 66232450000.

The previous prime is 165581127499. The next prime is 165581127539. The reversal of 165581127500 is 5721185561.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33113726 + ... + 33118725.

Almost surely, 2^165581127500 is an apocalyptic number.

165581127500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165581127500 is an abundant number, since it is smaller than the sum of its proper divisors (196511687584).

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

165581127500 is an equidigital number, since it uses as much as digits as its factorization.

165581127500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66232475 (or 66232458 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 41.

The spelling of 165581127500 in words is "one hundred sixty-five billion, five hundred eighty-one million, one hundred twenty-seven thousand, five hundred".