1581170126120 has 32 divisors (see below), whose sum is σ = 3831296845320. Its totient is φ = 583816661760.

The previous prime is 1581170126101. The next prime is 1581170126141. The reversal of 1581170126120 is 216210711851.

It can be written as a sum of positive squares in 4 ways, for example, as 1307057146756 + 274112979364 = 1143266^2 + 523558^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1520355371 + ... + 1520356410.

Almost surely, 2^{1581170126120} is an apocalyptic number.

1581170126120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581170126120 is an abundant number, since it is smaller than the sum of its proper divisors (2250126719200).

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

1581170126120 is a wasteful number, since it uses less digits than its factorization.

1581170126120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040711805 (or 3040711801 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 35.

Adding to 1581170126120 its reverse (216210711851), we get a palindrome (1797380837971).

The spelling of 1581170126120 in words is "one trillion, five hundred eighty-one billion, one hundred seventy million, one hundred twenty-six thousand, one hundred twenty".