1081175721616 has 15 divisors (see below), whose sum is σ = 2094786019081. Its totient is φ = 540585781216.

The previous prime is 1081175721589. The next prime is 1081175721617. The reversal of 1081175721616 is 6161275711801.

The square root of 1081175721616 is 1039796.

It is a perfect power (a square), and thus also a powerful number.

1081175721616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 818293923216 + 262881798400 = 904596^2 + 512720^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081175721617) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4029210 + ... + 4289158.

Almost surely, 2^{1081175721616} is an apocalyptic number.

1081175721616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1081175721616 is the 1039796-th square number.

It is an amenable number.

1081175721616 is a deficient number, since it is larger than the sum of its proper divisors (1013610297465).

1081175721616 is an frugal number, since it uses more digits than its factorization.

1081175721616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519906 (or 259951 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 46.

The spelling of 1081175721616 in words is "one trillion, eighty-one billion, one hundred seventy-five million, seven hundred twenty-one thousand, six hundred sixteen".